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2018-12-20 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/jpeg.c (ReadJPEGImage): Move return point for 'ping' mode until after jpeg_start_decompress() and after JPEG compression properties have been estimated. Fixes SourceForge issue #578 "gm identify with format "%[JPEG-Colorspace-Name]" does not work" and #586 "Identify returning wrong compression values".

2018-12-18 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/gif.c (ReadGIFImage): Don't throw an error if opacity is outside of the range of the image colors. Fix suggested by 莫红波 <hongbo.mo@upai.com> on the graphicsmagick-bugs mailinb list on Fri, 9 Oct 2015.

> - magick/memory.h (MagickAllocateClearedArray): New macro for allocating a cleared array.

> - magick/resize.c (ScaleImage): Patch by Troy Patteson which resolves SourceForge issue #381 "Artifacts when scaling a PNG with semi-transparent pixels".

>   ScaleImage() suffers from two problems related to the blending of fully transparent pixels with non-fully transparent pixels during the scaling operation.

>   The first is that the colour values for fully transparent pixels are contributing to the colour values of the blended pixels when they should not.

>   The second is that the colour values of pixels blended with fully and non-fully transparent pixels are scaled as though the fully transparent pixels contribute to the blended pixels' colour values when they should not. For example, if blending 10% of a fully opaque white pixel with 90% of a fully transparent black pixel one would expect the blended pixel RGBA values to be 255,255,255,25.5 assuming 8 bit colour but they are in fact 25.5,25.5,25.5,25.5.

>   The provided patch solves the first issue by treating the colour values of fully transparent pixels as zero and the second issue by recording the volume of each blended pixel made up of pxiels that are not fully transparent (0.1 in the above example) and then scaling the blended pixel RGB values by dividing by that amount. In the above example, 25.5/0.1 = 255.

2018-12-16 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dib.c (ReadDIBImage): DIB images claiming more than 8-bits per pixel are not colormapped. Reject such files. Fixes SourceForge issue #585 "Assertion Failure in coders/png.c:7503". The problem is in the DIB reader rather than PNG.
> - coders/miff.c (ReadMIFFImage): Detect and reject zero-length deflate-encoded row in MIFF version 0. Fixes oss-fuzz 11876 "graphicsmagick/coder_MIFF_fuzzer: Use-of-uninitialized-value in deflate_slow". (Credit to OSS-Fuzz)
> - configure.ac: Improve search for true Microsoft Windows fonts and provide better indication of results. Fix a typo which caused DcrawExtraOptions not to be evaluated correctly.

2018-12-15 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tiff.c (QuantumTransferMode): Be more strict about the requirements for CIE Log2(L) and LOGLUV images. (ReadTIFFImage): Apply memory resource limits to strip and tile allocations. (ReadTIFFImage): Rationalize tile width/height to reject large tile sizes which are much larger than the image dimensions. Fixes oss-fuzz 11824 "graphicsmagick/coder_BIGTIFF_fuzzer: Out-of-memory in graphicsmagick_coder_BIGTIFF_fuzzer". (Credit to OSS-Fuzz) (ReadTIFFImage): Return with error if TIFFClientOpen() reports errors yet still returns a TIFF handle.

2018-12-12 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tga.c (WriteTGAImage): Image rows/columns must not be larger than 65535. Fixes SourceForge #583 "heap-buffer-overflow in WriteTGAImage of tga.c".

2018-12-11 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/bmp.c (ReadBMPImage): Fix heap overflow in 32-bit build due to arithmetic overflow. Only happens if limits are changed from defaults. Fixes SourceForge #582 "heap-buffer-overflow in ReadBMPImage of bmp.c".

2018-12-09 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - common.shi.in (MAGICK_FONT): The test suite must pass even on systems where we don't find any fonts.

2018-12-08 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/miff.c (ReadMIFFImage): Sanitize claimed profile size before allocating memory for it. Fixes oss-fuzz 11781 "graphicsmagick/coder_MIFF_fuzzer: Out-of-memory in graphicsmagick_coder_MIFF_fuzzer". (Credit to OSS-Fuzz)

2018-12-05 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadMNGImage): Fix non-terminal MNG looping. Fixes oss-fuzz 11596 "graphicsmagick/coder_MNG_fuzzer: Timeout in graphicsmagick_coder_MNG_fuzzer". (Credit to OSS-Fuzz)

2018-12-04 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/xpm.c (WriteXPMImage): Assure that added colormap entry for transparent XPM is initialized. Fixes oss-fuzz 11617 "graphicsmagick/coder_XPM_fuzzer: Use-of-uninitialized-value in QueryColorname". (Credit to OSS-Fuzz)
> - coders/miff.c (ReadMIFFImage): Fix memory leak of profiles 'name' when claimed length is zero. Fixes oss-fuzz 11710 "graphicsmagick/coder_MIFF_fuzzer: Direct-leak in AllocateString". and oss-fuzz 11688 "graphicsmagick/coder_MIFF_fuzzer: Out-of-memory in graphicsmagick_coder_MIFF_fuzzer". (Credit to OSS-Fuzz)

2018-12-02 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - fuzzing/oss-fuzz-build.sh: Apply patch from Alex Gaynor to add Zstd to the oss-fuzz build.

2018-12-01 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - configure.ac (DcrawExtraOptions): For QuantumDepth > 8 pass -6 option to dcraw. Fixes SourceForge issue #568 "dcraw not returning 16 bit image even though quantum depth is set to 16".
> - fuzzing/oss-fuzz-build.sh (PKG_CONFIG_PATH): Build WebP prior to libtiff so that libtiff has a chance to find it.

2018-11-30 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/command.c (TimeImageCommand): Time command now shows 6 digits of elapsed time indication since this precision is often now available and it is useful to see.

2018-11-29 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - Magick++/lib/Magick++/Drawable.h: Fix use of clang diagnostic syntax. Addresses SourceForge bug #579 "'diagnostic pop' pragma without 'diagnostic push' in Drawable.h.".

2018-11-22 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/constitute.c (WriteImage): Eliminate use of just-freed memory in clone_info->magick when throwing exception due to no support for format. Fixes SourceForge issue #576 "heap use-after-freee when convert one format into another format".
> - magick/command.c (BenchmarkImageCommand): Benchmark command now shows 6 digits of elapsed time indication since this precision is often now available and it is useful to see.

2018-11-21 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - wand/wand_api.h ("C"): magick/api.h should be included prior to wand/wand_symbols.h. Change made due to report by yzh杨振宏 on Wed, 21 Nov 2018 via the graphicsmagick-bugs mailing list.

2018-11-20 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - magick/nt_base.c Fix a bug when OS does not support performance counter.

2018-11-20 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/nt_base.c (NTElapsedTime): Use QueryPerformanceFrequency() and QueryPerformanceCounter() to measure elapsed time for Windows.

2018-11-19 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - tiff/port/snprintf.c Fix for older Microsoft Visual Studio

2018-11-17 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - www/index.rst: Update in preparation for 1.3.31 release.
> - version.sh: Update library versioning in preparation for 1.3.31 release.
> - NEWS.txt: Update news in preparation for 1.3.31 release.

2018-11-15 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/command.c (BenchmarkUsage): Document the benchmark command better.

2018-11-14 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/resize.c (HorizontalFilter, VerticalFilter): quantum is a pointer so it's value can not be usefully flushed. Use a local variable and then update quantum pointer when done.

2018-11-11 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/*: Changed row_count tallying to use 'omp atomic' and status update to use 'omp flush' for progress and error indication. This replaces most use of 'omp critical' for this purpose. Changed some lumpy algorithms which were using 'static' scheduling to 'guided' scheduling due to observing better results. Also added prolific 'restrict' annotations where they were missing.
> - www/security.rst: Documented a PGP private key for file signing or private correspondence.

2018-11-10 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - www/authors.rst: Moved "Glenn Randers-Pehrson" and "Gregory J Wolfe" to the "Former Contributor" category.

2018-11-09 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - Added many GCC function annotations in the libraries and coders.

2018-11-07 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - configure.ac: Use printf rather than echo to portably expand tab requests in configuration summary.

2018-11-01 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - configure.ac: Use pkg-config data as the initial choice when configuring for FreeType 2.0 and libxml-2.0. Only fall back to invoking an external script (and then traditional methods) if pkg-config fails.
> - coders/msl.c (ProcessMSLScript): Release msl_image if OpenBlob fails. Similar to ImageMagick CVE-2018-18544. Problem was reported to us via email from Petr Gajdos on Thu, 1 Nov 2018.

2018-10-27 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/miff.c (WriteMIFFImage): Only run strlen(attribute->value) once per attribute since the length won't change. May address oss-fuzz 11158 "graphicsmagick/coder_MIFF_fuzzer: Timeout in graphicsmagick_coder_MIFF_fuzzer". (Credit to OSS-Fuzz)
> - Fix compilation warnings observed with GCC 8.2.0.

2018-10-26 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/pixel_iterator.c (PixelIterateMonoModifyImplementation): Use atomic and flush rather than critical construct for a small speedup.
> - magick/monitor.c (MagickMonitorFormatted): Serialize calls to the progress monitor so that the caller does not need to perform this serialization. (MagickMonitor): Serialize calls to the progress monitor so that the caller does not need to perform this serialization. This function is now marked as deprecated. (InitializeMagickMonitor): New private function to initialize monitor functionality. (DestroyMagickMonitor): New private function to destroy monitor functionality.

2018-10-23 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/gif.c (ReadGIFImage): Improve the efficiency of storing a GIF comment in order to avoid a DOS opportunity. Fixes oss-fuzz 11096 "graphicsmagick/coder_GIF_fuzzer: Timeout in graphicsmagick_coder_GIF_fuzzer". (Credit to OSS-Fuzz)

2018-10-21 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - PerlMagick/Makefile.PL.in: Use MAGICK_API_LIBS to obtain the list of libraries to use when linking.
> - configure.ac: OpenMP library is normally supplied due to a CFLAGS option so only supply it in cases where the CFLAGS option may be lost or it might not be used. Otherwise the compiler may apply the library twice when linking.

2018-10-20 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - configure.ac: Remove Ghostscript library support (--with-gslib) from configure script. The 'HasGS' pre-processor defines which were enabled by this remain in the source code so it is still possible to use this library if absolutely necessary (e.g. CPPFLAGS=-DHasGS LIBS=-lgs).
> - tests/rwfile.tap: Test TIFF format with all supported compression options.
> - tests/{rwblob.c, rwfile.c} (main): Use StringToCompressionType() to parse compression option. Also consider requested compression algorithm when deciding if format is lossy.
> - coders/tiff.c (WriteTIFFImage): WebP compression needs PHOTOMETRIC_RGB. Fix wrong rows-per-strip calculation when using LZMA compression.
> - tests/rwblob.tap: Added a rwblob test to verify that lower-case magick works.
> - magick/static.c (OpenModule): Upper case magick string before searching static modules list. Fixes Debian bug 911386 "libgraphicsmagick-q16-3: graphicsmagick 1.3.30 has made formats case-sensitive at the API level".
> - filters/analyze.c (AnalyzeImage): X and y should be unsigned long to match image rows/columns type. Calculate total pixels by simple multiplication rather than counting.

2018-10-14 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tiff.c (WriteTIFFImage): Support WebP compression in TIFF. This requires a libtiff release after 4.0.9.
> - magick/image.h ("C"): WebPCompression added to CompressionType enumeration.

2018-10-13 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - configure.ac: Configure for the Zstd library. Use --without-zstd to disable searching for this library. Libtiff may require this library to successfully link so static linkage could fail if searching for libzstd is disabled.
> - magick/image.h ("C"): ZSTDCompression added to CompressionType enumeration.
> - coders/tiff.c (WriteTIFFImage): Support Zstd compression in TIFF. This requires a libtiff release after 4.0.9.

2018-10-10 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/command.c (GMCommandSingle): Add 'compare' to the list of command names that gm will support as a command if copied to or linked from that name. There was already a 'compare' link installed when the '--enable-magick-compat' configure option is used, but it could not possibly function without being blessed by this list. Related to Debian bug #910652 "graphicsmagick-imagemagick-compat: Doesn't ship a compare tool".

2018-09-30 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - Magick++/lib/Magick++/Drawable.h: Block unused-private-field warnings from Clang due to _dummy members which were intentionally included in some parent class definitions.
> - magick/widget.c (XEditText): Fix compilation warnings about cases which fall-through.
> - magick/display.c (MagickXAnnotateEditImage): Fix compilation warnings about cases which fall-through.
> - coders/pict.c (WritePICTImage): Add more checks to memory allocation calculations.
> - magick/pixel_cache.c (DestroyCacheInfo): Eliminate intentional fall-through logic in switch statement which results in compiler warnings. Eliminate switch statements entirely and split unrelated logic.
> - coders/txt.c (ReadTXTImage): Fix comparison between pointer and '0' rather than NULL as was obviously intended.
> - coders/msl.c (MSLStartElement): Add missing 'break' statements after ThrowException() calls. Otherwise execution falls through into unrelated switch cases and throws a redundant exception.

2018-09-29 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/meta.c (parse8BIM): Eliminate repeated use of strlen() which scans the entire remaining string on each cycle. Fixes oss-fuzz 10667 "graphicsmagick/coder_IPTCTEXT_fuzzer: Timeout in graphicsmagick_coder_IPTCTEXT_fuzzer". (Credit to OSS-Fuzz)

2018-09-26 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/utility.c (MagickGetToken): Fix possible read up to four bytes beyond end of stack allocated token buffer. Fixes oss-fuzz 10653 "graphicsmagick/coder_MVG_fuzzer: Stack-buffer-overflow in MagickGetToken". (Credit to OSS-Fuzz)

2018-09-22 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - fuzzing/coder_fuzzer.cc (LLVMFuzzerTestOneInput): Limit the maximum number of JPEG progressive scans to 50.
> - coders/jpeg.c (ReadJPEGImage): Apply a default limit of 100 progressive scans before the reader quits with an error. This limit may be adjusted using the -define mechanism like -define JPEG:max-scan-number=500. Also respond more quickly to files which exceed the maximum image dimensions. Fixes oss-fuzz 10258 "graphicsmagick/coder_JPEG_fuzzer: Timeout in graphicsmagick_coder_JPEG_fuzzer". (Credit to OSS-Fuzz)

2018-09-20 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadMNGImage): mng_LOOP chunk must be at least 5 bytes long. Fixes oss-fuzz 10455 "graphicsmagick/coder_MNG_fuzzer: Use-of-uninitialized-value in ReadMNGImage". (Credit to OSS-Fuzz)

2018-09-15 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/render.c (TraceEllipse): Detect arithmetic overflow when computing the number of points to allocate for an ellipse. Fixes oss-fuzz 10306 "graphicsmagick/coder_MVG_fuzzer: Heap-buffer-overflow in TracePoint". (Credit to OSS-Fuzz)

2018-09-12 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/attribute.c (GenerateEXIFAttribute): Eliminate undefined shift. Also right-sized involved data types. Fixes oss-fuzz 10309 "graphicsmagick/coder_JPG_fuzzer: Undefined-shift in Read32s". (Credit to OSS-Fuzz)

2018-09-09 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/render.c (DrawClipPath): Fix Coverity 319663 "Null pointer dereferences". Totally insignificant.
> - coders/wpg.c (ReadWPGImage): Mask/fix Coverity 319664 "Error handling issues".
> - magick/attribute.c (FindEXIFAttribute): Change size types from signed to unsigned and check for unsigned overflow. (GenerateEXIFAttribute): Change size types from signed to unsigned and check for unsigned overflow. Fixes oss-fuzz 10283 "graphicsmagick/coder_JPG_fuzzer: Integer-overflow in GenerateEXIFAttribute". (Credit to OSS-Fuzz)
> - coders/sfw.c (ReadSFWImage): Enforce that file is read using the JPEG reader. (Credit to OSS-Fuzz)
> - coders/miff.c (ReadMIFFImage): Fix leak of 'values' buffer due to change made yesterday.
> - coders/mpc.c (ReadMPCImage): Fix leak of 'values' buffer due to change made yesterday. Fixes oss-fuzz 10277 "graphicsmagick/coder_MPC_fuzzer: Direct-leak in ReadMPCImage". (Credit to OSS-Fuzz)

2018-09-08 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/miff.c (ReadMIFFImage): Support legacy keyword 'color-profile' for ICC color profile as was used by ImageMagick 4.2.9.
> - coders/mpc.c (ReadMPCImage): Require that first keyword/value be id=MagickCache
> - coders/miff.c (ReadMIFFImage): Require that first keyword/value be id=ImageMagick.

2018-09-06 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dcm.c (DCM_ReadElement): Add more size checks.
> - coders/jnx.c (ExtractTileJPG): Enforce that JPEG tiles are read by the JPEG coder. Fixes oss-fuzz 10147 "graphicsmagick/coder_JNX_fuzzer: Use-of-uninitialized-value in funcDCM_PhotometricInterpretation". (Credit to OSS-Fuzz)

2018-09-10 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/wpg.c Zero fill raster error recovery.

2018-08-29 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/render.c (ConvertPrimitiveToPath): Second attempt to prevent heap write overflow of PathInfo array. Fixes oss-fuzz 10096 "Heap-buffer-overflow in ConvertPrimitiveToPath". (Credit to OSS-Fuzz)

2018-08-25 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tiff.c ("QuantumTransferMode"): CIE Log images with an alpha channel are not supported. Fixes oss-fuzz 10013 "graphicsmagick/coder_TIFF_fuzzer: Use-of-uninitialized-value in DisassociateAlphaRegion". (Credit to OSS-Fuzz)
> - magick/render.c (DrawImage): SetImageAttribute() appends new text to any existing value, leading to every increasing memory consumption if the existing value is not deleted first by the unwary. Fixes oss-fuzz 9983 "graphicsmagick/coder_MVG_fuzzer: Timeout in graphicsmagick_coder_MVG_fuzzer" and oss-fuzz 10016 "graphicsmagick/coder_MVG_fuzzer: Out-of-memory in graphicsmagick_coder_MVG_fuzzer". (Credit to OSS-Fuzz)
> - magick/utility.c (TranslateTextEx): Fix off-by-one in loop bounds check which allowed a one-byte stack write overflow. Fixes oss-fuzz 10055 "graphicsmagick/coder_MVG_fuzzer: Stack-buffer-overflow in TranslateTextEx". (Credit to OSS-Fuzz)
> - magick/render.c (DrawImage): Be more precise about error detection and reporting, and return from an error more quickly. Also added MAX_DRAWIMAGE_RECURSION pre-processor definition to allow adjusting the drawing recursion limit. The drawing recursion limit is still 100, which seems exceptionally generous.
> - magick/constitute.c (WriteImage): Produce a more useful error message if an encoding delegate is not available.
> - magick/nt_base.h (isnan): Try adding a MSVC replacement for missing isnan() function. Not yet tested.

2018-08-25 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/wpg.c This should fix intentional 64 bit file offset overflow as depictedin OSS-fuzz-9936. Thanks to OSS-Fuzz.

2018-08-22 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/render.c (ConvertPrimitiveToPath): Need to enlarge PathInfo array allocation to avoid possible heap write overflow. Fixes oss-fuzz 9651 "graphicsmagick/coder_MVG_fuzzer: Heap-buffer-overflow in ConvertPrimitiveToPath". (Credit to OSS-Fuzz)

2018-08-20 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/mpc.c (ReadMPCImage): Insist that the format be identified prior to any comment, and that there is only one comment.
> - coders/miff.c (ReadMIFFImage): Insist that the format be identified prior to any comment, and that there is only one comment. Fixes oss-fuzz 9979 "graphicsmagick/coder_MIFF_fuzzer: Timeout in graphicsmagick_coder_MIFF_fuzzer". This is not a serious issue, but the code runs slowly under UBSAN. (Credit to OSS-Fuzz)

2018-08-19 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/utility.c (MagickAtoFChk): Add additional validation checks for floating point values. NAN and +/- INFINITY values also map to 0.0. Fixes oss-fuzz 9630 "graphicsmagick/coder_MVG_fuzzer: Integer-overflow in IsNexusInCore" and oss-fuzz 9612 "graphicsmagick/coder_MVG_fuzzer: Integer-overflow in SetCacheNexus". (Credit to OSS-Fuzz)
> - magick/render.c (DrawImage): Add missing error-reporting logic to return immediately upon memory reallocation failure. Apply memory resource limits to PrimitiveInfo array allocation. Fixes oss-fuzz 9576 "graphicsmagick/coder_MVG_fuzzer: Null-dereference READ in DrawImage", oss-fuzz 9593 "graphicsmagick/coder_MVG_fuzzer: Out-of-memory in graphicsmagick_coder_MVG_fuzzer", oss-fuzz 9648 "graphicsmagick/coder_MVG_fuzzer: Unknown signal in DrawImage". (Credit to OSS-Fuzz)

2018-08-16 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coder/mat.c Explicitly reject non-seekable streams.

2018-08-15 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coder/mat.c Correctly check GetBlobSize(image) even for zipstreams.

2018-08-14 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c More aggresive data corruption checking.

2018-08-09 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/xbm.c (XBMInteger): Limit the number of hex digits parsed to avoid signed integer overflow. Fixes oss-fuzz 9746 "graphicsmagick/coder_XBM_fuzzer: Undefined-shift in XBMInteger". (Credit to OSS-Fuzz)

2018-08-07 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c Typecast difference to quantum.

2018-08-05 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/mat.c (InsertComplexFloatRow): Avoid signed overflow. Fixes oss-fuzz 9667 "graphicsmagick/coder_MAT_fuzzer: Integer-overflow in InsertComplexFloatRow". (Credit to OSS-Fuzz)
> - coders/xbm.c (ReadXBMImage): Add validations for row and column dimensions. Fixes oss-fuzz 9736 "graphicsmagick/coder_XBM_fuzzer: Out-of-memory in graphicsmagick_coder_XBM_fuzzer". (Credit to OSS-Fuzz)

2018-08-04 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/wpg.c Add mechanism to approve embedded subformats in WPG. This should mute oss-fuzz 9559. (Credit to OSS-Fuzz)

2018-07-24 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/mvg.c (ReadMVGImage): Fix memory leak added on 2018-07-21. Fixes oss-fuzz 9548 "graphicsmagick/coder_MVG_fuzzer: Direct-leak in CloneDrawInfo". (Credit to OSS-Fuzz)

2018-07-23 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/cineon.c (ReadCINEONImage): Fix SourceForge issue 571 "Unexpected hang on a crafted Cineon image" by detecting and quitting on EOF appropriately, and verifying that file size is sufficient for claimed pixel dimensions when possible.
> - fuzzing/oss-fuzz-build.sh, fuzzing/dictionaries/MVG.dict: Added MVG fuzzing dictionary by Alex Gaynor.

2018-07-22 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/pixel_cache.c (SetNexus): For requests one pixel tall, SetNexus() was wrongly using pixels in-core rather than using a staging area for the case where the nexus rows extend beyond the image raster boundary, leading to heap overflow. This can happen when virtual pixels outside the image bounds are accessed. Fixes oss-fuzz 9512 "graphicsmagick/graphicsmagick_coder_MVG_fuzzer: Heap-buffer-overflow in AcquireCacheNexus". (Credit to OSS-Fuzz)
> - magick/render.c (ExtractTokensBetweenPushPop): ExtractTokensBetweenPushPop() needs to always return a valid pointer into the primitive string. Fixes oss-fuzz 9511 "graphicsmagick/graphicsmagick_coder_MVG_fuzzer: Null-dereference READ in DrawImage". (Credit to OSS-Fuzz) (DrawPolygonPrimitive): Fix leak of polygon set when object is completely outside image. Fixes oss-fuzz 9513 "graphicsmagick/graphicsmagick_coder_MVG_fuzzer: Direct-leak in AllocateThreadViewDataSet". (Credit to OSS-Fuzz)

2018-07-21 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/blob.c (FileToBlob): Use confirm access APIs to verify that read access to this path is allowed by policy. Check that file is a regular file before proceeding to open and read from it.
> - coders/mvg.c (ReadMVGImage): Don't allow MVG files to side-load a file as the drawing primitive using '@' syntax. Fixes oss-fuzz 9494 "graphicsmagick/coder_MVG_fuzzer: Sanitizer CHECK failure in "((0)) != (0)" (0x0, 0x0)". (Credit to OSS-Fuzz)

2018-07-19 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/mvg.c (ReadMVGImage): Don't assume that in-memory MVG blob is a null-terminated C string. Fixes oss-fuzz 9469 "graphicsmagick/coder_MVG_fuzzer: Heap-buffer-overflow in AllocateString". (Credit to OSS-Fuzz)

2018-07-12 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/miff.c (ReadMIFFImage): Detect EOF when reading using ReadBlobZC() and avoid subsequent heap read overflow. Fixes oss-fuzz 9357 "graphicsmagick/coder_MIFF_fuzzer: Heap-buffer-overflow in ImportRGBQuantumType". (Credit to OSS-Fuzz)

2018-07-11 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - fuzzing/oss-fuzz-build.sh (CFLAGS): Try disabling SIMD instructions in libjpeg-turbo build.

2018-07-10 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (WriteOnePNGImage): Free png_pixels as soon as possible. This might help with oss-fuzz 9334 "graphicsmagick/coder_PNG8_fuzzer: Direct-leak in WriteOnePNGImage", which we have yet to reproduce. It is not clear if png_pixels is being clobbered by longjmp or if something else is going on.

2018-06-26 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/jpeg.c (ReadJPEGImage): Provide a memory resource limit (of 1/5th the memory resource limit for Graphicsmagick) to libjpeg to limit how much memory it might consume for itself while reading a file. Fixes oss-fuzz 9096 "graphicsmagick/coder_JPEG_fuzzer: Timeout in graphicsmagick_coder_JPEG_fuzzer". (Credit to OSS-Fuzz) (ReadJPEGImage): Make sure that JPEG pixels array is initialized in case libjpeg fails to completely initialize it. May fix oss-fuzz 9115 "graphicsmagick/coder_JPEG_fuzzer: Use-of-uninitialized-value in ReadJPEGImage". We are not sure since the problem was not reproduced. (Credit to OSS-Fuzz)

2018-06-23 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - version.sh: Update library versioning for 1.3.30 release.
> - NEWS.txt: Update news for 1.3.30 release.

2018-06-22 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dpx.c (ReadDPXImage): Report exception on EOF file reading DPX pixel data. Fixes oss-fuzz 8104 "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in WriteDPXImage", oss-fuzz 8297 "graphicsmagick/enhance_fuzzer: Use-of-uninitialized-value in EnhanceImage", and oss-fuzz 8133 "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in RGBTransformPackets". (Credit to OSS-Fuzz)

2018-06-20 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/cmyk.c (ReadCMYKImage): Free scanline buffer in error path. Fixes SourceForge issue #567 "small memory leak in rgb.c, gray.c and cmyk.c" reported by Petr Gajdos.
> - coders/gray.c (ReadGRAYImage): Free scanline buffer in error path. Fixes SourceForge issue #567 "small memory leak in rgb.c, gray.c and cmyk.c" reported by Petr Gajdos.
> - coders/rgb.c (ReadRGBImage): Free scanline buffer in error path. Fixes SourceForge issue #567 "small memory leak in rgb.c, gray.c and cmyk.c" reported by Petr Gajdos.
> - coders/jpeg.c (ReadJPEGImage): Avoid memory leak of profile buffer when longjmp-based exception is thrown while reading a profile. Fixes oss-fuzz 8957 "graphicsmagick/enhance_fuzzer: Direct-leak in ReadGenericProfile". (Credit to OSS-Fuzz)

2018-06-17 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/xcf.c (load_level): Make sure to free 'tile_image' before returning exception. Fixes oss-fuzz 8935 "graphicsmagick/coder_XCF_fuzzer: Indirect-leak in CloneImage". (Credit to OSS-Fuzz)
> - coders/jpeg.c (ReadJPEGImage): Allow three warnings of any given type before promoting the next warning of the same type to a hard error. The warning limit may be adjusted by the user using -define jpeg:max-warnings=<value>. Fixes oss-fuzz 8704 "graphicsmagick/coder_JPG_fuzzer: Out-of-memory in graphicsmagick_coder_JPG_fuzzer". (Credit to OSS-Fuzz)
> - coders/png.c (ReadPNGImage): Detect EOF when reading magic_number. Fixes oss-fuzz 8944 "graphicsmagick/coder_PNG_fuzzer: Use-of-uninitialized-value in ReadPNGImage". (Credit to OSS-Fuzz) (ReadPNGImage, ReadJNGImage): Makes sure that return value of ReadBlob() is always checked to detect EOF.

2018-06-16 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tiff.c (ReadTIFFImage): Re-structure exception reporting so that QuantumTransferMode() exceptions thrown for PLANARCONFIG_SEPARATE images are handled immediately. Fixes oss-fuzz 8896 "graphicsmagick/coder_BIGTIFF_fuzzer: Use-of-uninitialized-value in DisassociateAlphaRegion". (Credit to OSS-Fuzz) (ReadTIFFImage): tsize_t is a signed type so be prepared for unexpected negative values produced by libtiff size functions. Fixes oss-fuzz 8934 "graphicsmagick/coder_TIFF_fuzzer: Sanitizer CHECK failure in "((0)) != (0)" (0x0, 0x0)". (Credit to OSS-Fuzz)

2018-06-16 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/wpg.c Fix oss-fuzz 7735 "graphicsmagick/coder_WPG_fuzzer: Use-of-uninitialized-value in ReadWPGImage". (Credit to OSS-Fuzz)

2018-06-11 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadMNGImage): ENDL chunk must be at least one byte in size. Fixes oss-fuzz 8832 "graphicsmagick/coder_MNG_fuzzer: Null-dereference READ in ReadMNGImage". (Credit to OSS-Fuzz) (ReadMNGImage): Length of DISC chunk must be evenly divisible by 2. Fixes oss-fuzz 8834 "graphicsmagick/coder_MNG_fuzzer: Heap-buffer-overflow in ReadMNGImage". (Credit to OSS-Fuzz)

2018-06-10 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/mpc.c (ReadMPCImage): Detect end of file while reading image directory. Similar to MIFF fixes for ImageMagick CVE-2017-18272. (RegisterMPCImage): Require seekable stream since MPC is strictly a file-based format and so GetBlobSize() is assured to work. Similar to MIFF behavior. Claimed to be part of the resolution for ImageMagick CVE CVE-2017-11449. Suggested by Petr Gajdos via email on January 3, 2018.

2018-06-09 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/miff.c (ReadMIFFImage): Detect end of file while reading image directory. Fixes SourceForge issue 565 "ImageMagick CVE-2017-18272 applies to GraphicsMagick". Thanks to Petr Gajdos for reporting this issue to us.
> - magick/import.c (ImportViewPixelArea): Use appropriate bits_per_sample validations for FloatQuantumSampleType. Fixes oss-fuzz 8780 "graphicsmagick/coder_PTIF_fuzzer: Use-of-uninitialized-value in HorizontalFilter". (Credit to OSS-Fuzz)

2018-06-09 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c More than 4GiB are not supported in MAT!

2018-06-09 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/mat.c (ReadMATImage): Add casts to avoid arithmetic overflow when computing size and offsets. Fixes oss-fuzz 8801 "graphicsmagick/coder_MAT_fuzzer: Timeout in graphicsmagick_coder_MAT_fuzzer". (Credit to OSS-Fuzz)
> - magick/blob.c (ReadBlobLSBDoubles, ReadBlobMSBDoubles): Only byte-swap doubles or test doubles for NAN if we have read enough bytes for at least one double value. (ReadBlob): Add an assertion to enforce that ReadBlob() will never report reading more bytes than requested due to some implementation issue.

2018-06-08 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/blob.c (ReadBlob, WriteBlob): gzread(), BZ2_bzread(), gzwrite(), BZ2_bzwrite() return type 'int' rather than 'size_t' like their stdio equivalents. Use correct signed type to avoid returning a negative value into an unsigned type, forming a huge positive value. Fixes oss-fuzz 8600 "graphicsmagick/coder_MAT_fuzzer: Heap-buffer-overflow in ReadBlobLSBDoubles". (Credit to OSS-Fuzz)

2018-06-07 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (png_read_raw_profile): Try to shore up parsing of raw profile reading to avoid heap read overruns. Fixes oss-fuzz 8763 "graphicsmagick/coder_PNG32_fuzzer: Heap-buffer-overflow in png_read_raw_profile". (Credit to OSS-Fuzz)

2018-06-07 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c Reduce stack usage for 64 bit architecture.

2018-06-06 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/wpg.c Check return values of SeekBlob for more safety.

2018-06-06 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadOneJNGImage): Use DestroyImageList() rather than DestroyImage() on returned Image from supposed read of JPEG data, in case multiple frames were unexpectedly returned. Also add "JPEG:" prefix to filename when reading from temporary file to force that it can only be read as a JPEG file, disabling format auto-detection based on file header. Fixes oss-fuzz 8755 "graphicsmagick/coder_JNG_fuzzer: Indirect-leak in AllocateImage". (Credit to OSS-Fuzz)

2018-06-05 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/blob.c (EOFBlob): Implement EOF detection for ZipStream. Does some archaic zlib not provide gzeof()? Fixes oss-fuzz 8550 "graphicsmagick/coder_MAT_fuzzer: Timeout in graphicsmagick_coder_MAT_fuzzer". (Credit to OSS-Fuzz)

2018-06-04 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadOnePNGImage): Skip adding empty raw profile. Fixes oss-fuzz "graphicsmagick/coder_PNG_fuzzer: Heap-buffer-overflow in png_read_raw_profile". (Credit to OSS-Fuzz)

2018-06-03 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - NEWS.txt: Update NEWS with latest changes.
> - coders/dcm.c (DCM_ReadRGBImage): Force the image to DirectClass to avoid later use of uninitialized indexes. Fixes oss-fuzz 8602 "graphicsmagick/coder_DCM_fuzzer: Use-of-uninitialized-value in DCM_PostRescaleImage". (Credit to OSS-Fuzz) (DCM_ReadPlanarRGBImage): Force the image to DirectClass to avoid later use of uninitialized indexes.
> - coders/png.c (ReadMNGImage): Free chunk memory in error reporting path to avoid leak. Fixes oss-fuzz 8721 "graphicsmagick/coder_MNG_fuzzer: Direct-leak in ReadMNGImage". (Credit to OSS-Fuzz)

2018-06-02 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/constitute.c (ReadImage): Assure that an error exception is thrown if coder returns null without properly reporting an exception.
> - magick/blob.c (BlobToImage): Assure that an error exception is thrown if coder returns null without properly reporting an exception.
> - coders/png.c (ReadMNGImage): Disable mystery "linked list is corrupted" code. Assure that exceptions are reported to the correct place so they are not lost. Fixes oss-fuzz 8710 "graphicsmagick/coder_MNG_fuzzer: Indirect-leak in AllocateImage". (Credit to OSS-Fuzz)
> - coders/tiff.c (ReadTIFFImage): Initialize allocated scanline, strip, or tile to zero in order to avoid complaint about use of uninitialized data if libtiff fails to write all the bytes. Fixes oss-fuzz 8551 "graphicsmagick/coder_TIFF_fuzzer: Use-of-uninitialized-value in ImportGrayQuantumType". (Credit to OSS-Fuzz)
> - magick/annotate.c (RenderFreetype): Throw an exception if DrawInfo font is null. Should fix oss-fuzz 8557 "graphicsmagick/coder_PCD_fuzzer: Unknown signal in RenderFreetype" and may fix oss-fuzz 8544 "graphicsmagick/coder_PCD_fuzzer: Null-dereference READ in RenderFreetype". (Credit to OSS-Fuzz)
> - coders/jpeg.c (ReadGenericProfile): Add/improve tracing for profile size and when JPEG header is being read.

2018-06-01 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadOneJNGImage): Report a useful exception for the case when the JNG file fails to provide the necessary image chunks to allocate the color image. Inspired by oss-fuzz 8666 "graphicsmagick/coder_JNG_fuzzer: ASSERT: data != (const char *) NULL" although the reported issue was not reproduced.

2018-05-31 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadMNGImage): Fix off-by-one in length validation for TERM chunk which allowed one byte heap read overflow. Fixes oss-fuzz 8615 "graphicsmagick/coder_MNG_fuzzer: Heap-buffer-overflow in mng_get_long". (Credit to OSS-Fuzz) (ReadMNGImage): Fix leak of MngInfo in error reporting path. Fixes oss-fuzz 8604 "graphicsmagick/coder_MNG_fuzzer: Direct-leak in ReadMNGImage". (Credit to OSS-Fuzz) (ReadMNGImage): Verify that claimed chunk size does not exceed input size. Fixes oss-fuzz 8564 "graphicsmagick/coder_MNG_fuzzer: Out-of-memory in graphicsmagick_coder_MNG_fuzzer". (Credit to OSS-Fuzz)
> - coders/tiff.c (ReadTIFFImage): Reject files with excessive samples-per-pixel or extra-samples. Avoids potential issues observed in oss-fuzz 8634 "graphicsmagick/coder_BIGTIFF_fuzzer: Undefined-shift in ImportAlphaQuantumType". (Credit to OSS-Fuzz)

2018-05-30 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadMNGImage): Assure that object id index is always less than MNG_MAX_OBJECTS to avoid overflow. Fixes oss-fuzz 8596 "graphicsmagick/coder_MNG_fuzzer: Index-out-of-bounds in ReadMNGImage" and likely other issues yet to be reported. (Credit to OSS-Fuzz)

2018-05-30 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (CompareEdges): Per ticket #562, function CompareEdges() did not conform to the qsort() requirement that if CompareEdges(edge0,edge1) returns -1 (i.e., edge0 "less than" edge1), then CompareEdges(edge1,edge0) should return 1 (edge1 "greater than" edge0). This has been fixed.

2018-05-30 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadOneJNGImage): Deal with JDAA JNG chunk with length zero. Fixes oss-fuzz 8562 "graphicsmagick/coder_JNG_fuzzer: ASSERT: data != (const char *) NULL". (Credit to OSS-Fuzz)
> - coders/tiff.c (ReadTIFFImage): Check that the bits-per-sample is supported by the implementation before attempting to decode the image. Fixes oss-fuzz 8554 "graphicsmagick/coder_BIGTIFF_fuzzer: Undefined-shift in MagickBitStreamMSBWrite". (Credit to OSS-Fuzz)
> - coders/png.c (ReadMNGImage): Eliminate use of uninitialized header magic data by checking for EOF first. Fixes oss-fuzz 8597 "graphicsmagick/coder_MNG_fuzzer: Use-of-uninitialized-value in ReadMNGImage". (Credit to OSS-Fuzz)

2018-05-25 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - fuzzing/oss-fuzz-build.sh: More fixes based on what is observed in oss-fuzz build log.

2018-05-24 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/jnx.c The attribute should belong to only one scene and not to whole image list.

2018-05-24 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - fuzzing/oss-fuzz-build.sh: Changes to add CPPFLAGS to configure executions to hopefully get oss-fuzz build closer to success.

2018-05-23 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - PerlMagick/t/jpeg/read.t: Add a JNX reader test case.
> - coders/jnx.c (ReadJNXImage): JNX image depth should be 8.
> - fuzzing/oss-fuzz-build.sh: Apply patch from Alex Gaynor to switch libpng to autotools build system, as well as configure GraphicsMagick with '--with-quantum-depth=16'.

2018-05-22 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tiff.c (ReadTIFFImage): Validate tile memory requests for the TIFFReadRGBATile() case in the same way as the TIFFReadTile() case. Fixes oss-fuzz 8434 "graphicsmagick/coder_BIGTIFF_fuzzer: Out-of-memory in graphicsmagick_coder_BIGTIFF_fuzzer". (Credit to OSS-Fuzz)

2018-05-21 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tile.c (ReadTILEImage): Remove any existing size request when while image to tile. This avoids size being used for both the input image size and the tile image size. Fixes SourceForge issue #563 "tile:<image> appears to blow image up by 100% before applying tiling".

2018-05-20 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - fuzzing/oss-fuzz-build.sh: Patch from Paul Kehrer to disable libpng test programs and binaries while building libpng in support of oss-fuzz testing.
> - coders/dcm.c (DCM_ReadGrayscaleImage): If a palette was provided, the image may be in PseudoClass but we need DirectClass for gray image when GRAYSCALE_USES_PALETTE is not defined. Fixes oss-fuzz 7550 "graphicsmagick/coder_DCM_fuzzer: Use-of-uninitialized-value in SyncImageCallBack". (Credit to OSS-Fuzz) (ReadDCMImage): Restore use of DCM_PostRescaleImage() in order to obtain suitably scaled DICOM again. Hopefully it is more robust now. (DCM_ReadPaletteImage): Assure that DirectClass pixels are initialized.

2018-05-19 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tiff.c (ReadTIFFImage): Remove strange addition of image->columns to pixel buffer offsets which now causes a heap overflow since the buffer has been right-sized. Perhaps the extra offset plus the over-sized allocation was some attempt to avoid buffer over/underflows due to bugs in libtiff. Fixes oss-fuzz 8384 "graphicsmagick/coder_BIGTIFF_fuzzer: Heap-buffer-overflow in put1bitbwtile" which is described to be a regression. (Credit to OSS-Fuzz)
> - magick/render.c (DrawImage): Fix wrong range checks which caused spurious "Parsing of SVG images fail with "Non-conforming drawing primitive definition (push)" failure. Fixes SourceForge issue 561 "Parsing of SVG images fail with "Non-conforming drawing primitive definition (push)"" which is due to problems caused by the fix for SourceForge issue 517.
> - coders/tiff.c (WritePTIFImage): Use '-define ptif:minimum-geometry=<geometry>' to specify the smallest subresolution frame which is produced by the PTIF (Pyramid TIFF) writer.

2018-05-18 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tiff.c (WritePTIFImage): Allow 1x1 input image to be supported.
> - coders/png.c (ReadOneJNGImage): Unconditionally free JDAT chunk memory. Fixes oss-fuzz 8366 "graphicsmagick/coder_JNG_fuzzer: Direct-leak in ReadOneJNGImage". (Credit to OSS-Fuzz)
> - coders/tiff.c (WritePTIFImage): Fix leak of pyramid Image list if ResizeImage() fails. Fixes oss-fuzz 8364 "graphicsmagick/coder_PTIF_fuzzer: Indirect-leak in CloneImage". (Credit to OSS-Fuzz)

2018-05-17 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tiff.c (WriteTIFFImage): Add and use ThrowTIFFWriterException() macro to consistently clean-up when throwing writer exception. May fix oss-fuzz 8321 "graphicsmagick/coder_EPT_fuzzer: Direct-leak in TIFFClientOpen". (Credit to OSS-Fuzz) (ReadTIFFImage): Add and use ThrowTIFFReaderException() macro to consistently clean-up when throwing reader exception.

2018-05-16 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/alpha_composite.h (AlphaCompositePixel): The macro definition for MagickAlphaCompositeQuantum in alpha_composite.h computes an expression of the form:

>   a * b + c * d * e

>   Code in function AlphaCompositePixel() (also in alpha_composite.h) multiplies the result of this macro by variable "delta" as follows:

>   delta * a * b + c * d * e

>   However, the intended result is actually:

>   delta * ( a * b + c * d * e )

>   The macro definition has been modified to enclose the entire expression in parentheses.

>   The effects of this bug were particularly evident at the boundary between a stroked polygon and a transparent black region. More generally, an incorrect composited pixel value was being computed by AlphaCompositePixel() whenever the output alpha value was not 100% opaque.

2018-05-16 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - tests/rwblob.tap: Add a test for PTIF format.
> - coders/tiff.c (WritePTIFImage): Fix Image blob referencing in order to avoid double-free when writing PTIF to memory BLOB. Fixes oss-fuzz 8280 "graphicsmagick/coder_PTIF_fuzzer: Heap-double-free in Magick::BlobRef::~BlobRef". (Credit to OSS-Fuzz)

2018-05-14 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tiff.c (WriteTIFFImage): Use libtiff's TIFFDefaultStripSize() function rather than an old porting macro required by some defunct libtiff version. Expected to fix oss-fuzz 8248 "graphicsmagick/coder_EPT_fuzzer: Floating-point-exception in WriteTIFFImage". (Credit to OSS-Fuzz)

2018-05-13 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c Fix potentional leak when compressed object is corrupted. Fixes oss-fuzz 8251 (Credit to OSS-Fuzz)

2018-05-13 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tiff.c (ReadTIFFImage): Fix leak of Image when TIFFReadRGBAImage() reports failure. Also harden buffer allocation calculation. Fixes oss-fuzz 8275 "graphicsmagick/coder_BIGTIFF_fuzzer: Indirect-leak in AllocateImage". (Credit to OSS-Fuzz)
> - coders/ept.c (ReadEPTImage): Add validations of 'count' and 'filesize' read from EPT file. In response to oss-fuzz 8248 "graphicsmagick/coder_EPT_fuzzer: Floating-point-exception in WriteTIFFImage" but we are unable to recreate the oss-fuzz issue since the EPT reader already immediately reports an EOF exception.

2018-05-12 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - fuzzing/oss-fuzz-build.sh: Apply SourceForge patch #57 "Add fuzzing support for jpeg + freetype delegates" by Alex Gaynor.
> - coders/png.c (read_user_chunk_callback): Fix memory leak and use of uninitialized memory when handling eXIf chunk. Fixes oss-fuzz 8247 "graphicsmagick/coder_PNG24_fuzzer: Direct-leak in png_malloc". (Credit to OSS-Fuzz)

2018-05-11 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - fuzzing/oss-fuzz-build.sh: Apply SourceForge patch #56 "Use a few delegate libraries in fuzzing" by Alex Gaynor.

2018-05-10 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - tests/rwfile.tap: MIFF zip and bzip compression tests do not fail if zlib and bzlib are not available because the compression request is silently changed to no compression.

2018-05-07 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (DrawImage, InsertAttributeIntoInputStream): For a reference such as 'class="classname"', the "classname" is now allowed to be undefined.
> - coders.svg.c (ProcessStyleClassDefs): Class definitions defined within a <style> block may now be empty.
> - These relaxed conditions are not specifically called out in the SVG spec as being either acceptable or unacceptable, but other SVG renderers (e.g., Chrome) handle them this way. These changes do not resolve, but are related to, ticket #307.

2018-05-05 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - utilities/Makefile.am (utilities/tests/montage.log): Fix dependency rule so that effects.tap is fully executed before execution of montage.tap starts.

2018-05-04 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (DrawImage, TraceXXX): The PrimitiveInfo array used to store points generated by TraceEllipse(), the other TraceXXX() functions, and DrawImage() was not always being expanded when needed, resulting in writes beyond the end of the currently allocated storage. To fix this problem, a new data structure PrimitiveInfoMgr, and an associated function, PrimtiveInfoRealloc(), were written to handle expanding the PrimitiveInfo array as needed. DrawImage() and the TraceXXX() functions were modified to prevent the out of bounds writes to memory. This fixes ticket #516.

2018-05-03 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadOneJNGImage): Add more JNG chunk validations. Fixes an issue reported by "Trace Probe" via a follow-up post to SourceForge issue 437 "assertion failure in WriteBlob", although the issue described was not reproduced.
> - coders/meta.c (ReadMETAImage): Detect and report 8BIMTEXT and 8BIMWTEXT decoding problems. Fixes oss-fuzz 8125 "graphicsmagick/coder_8BIMTEXT_fuzzer: Use-of-uninitialized-value in format8BIM". (Credit to OSS-Fuzz)

2018-05-02 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (TraceStrokePolygon): Excessively large values of stroke-width were cascading through other computations, causing the function to write beyond the end of it's array of points when the stroke-linejoin attribute value was "round". Code was added to reallocate the array of points as needed, and to limit the size of stroke-width (for computational purposes) to no more than approximately twice the diagonal size of the output image. Fixes ticket #515.
> - The same limit on stroke-width was applied to all other instances of the same computation in render.c.

2018-05-01 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - This change set fixes ticket #471.
> - magick/render.c (DrawImage): Polylines with fewer than two points were being flagged as an error. The SVG spec has no such restriction (fixed).
> - coders/svg.c (SVGStartElement) Inner <svg> elements could modify the output image dimensions if a geometry string was supplied. Now the output image dimensions are determined by the outermost <svg> only.

2018-05-01 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (TraceEllipse, TraceRectangle, TraceRoundRectangle): Per the SVG spec, rectangles and round rectangles having a width or height of zero are not rendered. Also per the spec, ellipses having an x or y radius of zero are not rendered. Fixes ticket #457.

2018-04-30 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.h, (PrimitiveInfo), magick/render.c: Added member "flags" to PrimitiveInfo to support indicating closed shapes (e.g., rectangle, circle, path closed using 'z' or 'Z'). Updated code in render.c (functions TraceXXX) to indicate closed shapes. This replaces the previous policy of detecing closed shapes by comparing the first and last points to see if they are identical (within MagickEpsilon). The old policy prevented open subpaths with the same first and last point from being rendered properly (per the SVG spec) when round or square endcaps were enabled. Part of the fix for ticket #322.
> - magick/render.c (ConvertPrimitiveToPath): Modified duplicate point elimination code so that the first and last points of a subpath are always preserved. Consequences: (1) Allows for the correct rendering of the sequence "move x1 y1 line x1 y1" with round or square endcaps. Part of the fix for ticket #322. (2) Fixes a bug in which eliminating the last point as a duplicate caused a closed shape to no longer be closed. This would manifest itself, for example, as a small "nub" on the boundary of a filled circle.
> - magick/render.c (GetPixelOpacity): Fixed a bug in the code that computed the distance between a point and a segment (polygon edge). Prior to this fix, for zero length segments this code would generate a divide-by-zero and incorrect output. Part of the fix for ticket #322.
> - magick/render.c (DrawPolygonPrimitive): Polygons/paths with zero or one points are no longer rendered per the SVG spec.
> - magick/render.c (DrawStrokePolygon): Per the SVG spec, a polygon consisting of a single move-to command is not stroked.
> - magick/render.c (TracePath): Per the SVG spec, if the endpoints (x1, y1) and (x2, y2) of an arc subpath are identical, then this is equivalent to omitting the elliptical arc segment entirely. For rendering purposes the zero length arc is treated like a zero length "line to" command to the current point.
> - magick/render.c (TraceStrokePolygon): Added code to detect zero length open subpaths and return a stroked polygon containing no points when round or square endcaps are not enabled. This satisfies the SVG spec requirement that zero length subpaths are only stroked if the 'stroke-linecap' property has a value of round or square.
> - magick/render.c (TracePath): Fixed a bug in which if a "move to" command was followed by additional pairs of points, indicating implied "line to" commands, each point was added twice.

2018-04-30 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pcx.c (ReadPCXImage): Colormap from PCX header is only used if colors <= 16. Determination of DirectClass image was wrong. Fixes oss-fuzz 8093 "graphicsmagick/coder_PCX_fuzzer: Use-of-uninitialized-value in IsMonochromeImage". (Credit to OSS-Fuzz)

2018-04-29 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - version.sh: Updates to prepare for the 1.3.29 release.
> - coders/pict.c (DecodeImage): Assure that scanline is initialized to avoid use of uninitialized data. Fixes oss-fuzz 8063 "graphicsmagick/coder_WPG_fuzzer: Use-of-uninitialized-value in ReadPICTImage". (Credit to OSS-Fuzz)
> - coders/dpx.c (ReadDPXImage): Assure that NULL pixels is not used. Fixes oss-fuzz 8078 "graphicsmagick/coder_DPX_fuzzer: Null-dereference WRITE in ReadDPXImage". (Credit to OSS-Fuzz)
> - NEWS.txt: Update NEWS file with information about changes since last release.

2018-04-28 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dib.c (ReadDIBImage): Disable EOF tests for "ICODIB" subformat due to icon file provided by SourceForge issue #557 "ErrorCorruptImage: Magick: Unexpected end-of-file ()" where an EOF error was reported due to no mask data being supplied.
> - coders/png.c (ReadOneJNGImage): The embedded JPEG image is required to have the same dimensions as the JNG image as provided by JHDR. Fixes SourceForge bug 555 "heap-buffer-overflow in AcquireCacheNexus when processing jng file". It is likely that this issue is precipitated by using 'montage' which seems to set a default non-zero image size. (ReadMNGImage): By default limit the maximum loops specifiable by the MNG LOOP chunk to 512 loops, but allow this to be modified by '-define mng:maximum-loops=value'. Also assure that the value is in the range of 0-2147483647 as per the MNG specification. This is to address the denial of service issue described by CVE-2018-10177. This problem was reported to us by Petr Gajdos via email on Fri, 20 Apr 2018.
> - coders/dpx.c (ReadDPXImage): Move misplaced channel validation code. Fixes oss-fuzz 8041 "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in WriteDPXImage" and oss-fuzz 8055 "graphicsmagick/enhance_fuzzer: Use-of-uninitialized-value in EnhanceImage". (Credit to OSS-Fuzz)

2018-04-27 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/xpm.c (StringToListMod): Algorithm fixes to fix use of uninitialized data. Fixes oss-fuzz 8046 "graphicsmagick/coder_XPM_fuzzer: Use-of-uninitialized-value in StringToListMod". (Credit to OSS-Fuzz)

2018-04-26 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/xpm.c (ReadXPMImage): Reduce memory consumption further. Hopefully fixes oss-fuzz 8013 "graphicsmagick/coder_XPM_fuzzer: Out-of-memory in graphicsmagick_coder_XPM_fuzzer". (Credit to OSS-Fuzz)
> - magick/utility.c (StringToList): Only allocate the memory required when converting string to an ASCII list. May or may not fix oss-fuzz 8013 "graphicsmagick/coder_XPM_fuzzer: Out-of-memory in graphicsmagick_coder_XPM_fuzzer". (Credit to OSS-Fuzz)

2018-04-24 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/bmp.c (ReadBMPImage): Fix benign use of uninitialized data when testing header magick. Fixes oss-fuzz 7980 "graphicsmagick/coder_BMP_fuzzer: Use-of-uninitialized-value in LocaleNCompare". (Credit to OSS-Fuzz)
> - coders/dpx.c (ReadDPXImage): ColorDifferenceCbCr does require even image width. Fixes oss-fuzz 7966 "graphicsmagick/coder_DPX_fuzzer: Unknown signal in TentUpsampleChroma". (Credit to OSS-Fuzz)

2018-04-23 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dpx.c (ReadDPXImage): ColorDifferenceCbCr element requires two samples/pixel, not one. Fixes oss-fuzz 7951 "graphicsmagick/coder_DPX_fuzzer: Heap-buffer-overflow in ReadDPXImage". (Credit to OSS-Fuzz)

2018-04-22 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pdb.c (ReadPDBImage): Assure that pixels buffer is initialized. Fixes oss-fuzz 7937 "graphicsmagick/coder_PDB_fuzzer: Use-of-uninitialized-value in ReadPDBImage". (Credit to OSS-Fuzz)
> - coders/mvg.c (ReadMVGImage): Assure that MVG viewbox parameters were supplied. Fixes oss-fuzz 7936 "graphicsmagick/coder_MVG_fuzzer: Use-of-uninitialized-value in ReadMVGImage". (Credit to OSS-Fuzz)
> - coders/dpx.c (ReadDPXImage): Element descriptors CbYCrY422 and CbYACrYA4224 require that the image width be evenly divisible by 2 so enforce that. Fixes oss-fuzz 7935 "graphicsmagick/coder_DPX_fuzzer: Heap-buffer-overflow in ReadDPXImage". (Credit to OSS-Fuzz)

2018-04-21 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dpx.c (ReadDPXImage): Reject DPX files which claim to use signed data. Fixes oss-fuzz 7758 "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in WriteDPXImage". (Credit to OSS-Fuzz) (ReadDPXImage): Validate that the image elements do update all of the channels, including the alpha channel. Now report an error if a color channel is missing. Fixes oss-fuzz 7758 "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in WriteDPXImage".
> - coders/gif.c (DecodeImage): Finally fix oss-fuzz 7732 "graphicsmagick/coder_GIF_fuzzer: Heap-buffer-overflow in DecodeImage" which was not actually fixed with previous changes. (Credit to OSS-Fuzz)

2018-04-21 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/topol.c Emit error when tile storage overflows image data;
>     fixes oss-fuzz 7769 thanks to oss-fuzz.

2018-04-20 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (ConvertPrimitiveToPath): Fixed a bug in which SVG paths containing multiple open subpaths were not being processed correctly, resulting in incorrect output. This fixes ticket #94.

2018-04-18 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/gif.c (DecodeImage): Fix use of uninitialized memory during error condition in decoder. Fixes oss-fuzz 7732 "graphicsmagick/coder_GIF_fuzzer: Heap-buffer-overflow in DecodeImage". (Credit to OSS-Fuzz)
> - coders/txt.c (ReadTXTImage): Assure that all image pixels are initialized to black.
> - Magick++/demo/zoom.cpp (main): Add a -read-blob option to read input file into a Blob so that it is read by the Blob reader rather than the file reader. Default the output Geometry to the input image geometry in case the user does not specify a resize resolution or geometry.
> - Magick++/tests/readWriteBlob.cpp (main): Improve the quality of code which reads a file into memory for Blob testing.
> - magick/blob.c (BlobToImage): Add exception reports for the cases where 'magick' was not set and the file format could not be deduced from its header. Previously a null Image pointer was being returned without any exception being thrown.

2018-04-15 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dpx.c (ReadDPXImage): Assure that CbCr layer initializes all channels if it is the first element of a planar DPX. Fixes oss-fuzz 7703 "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in WriteDPXImage". (Credit to OSS-Fuzz)
> - coders/pict.c (ReadPICTImage): Don't refer to filename member of ImageInfo which was just destroyed. Much thanks to Alex Gaynor for finding this. Should fix oss-fuzz 6867 "graphicsmagick/coder_PCT_fuzzer: Heap-use-after-free in GetLocaleExceptionMessage". (Credit to OSS-Fuzz).

2018-04-14 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/sgi.c (ReadSGIImage): Assure that iris pixels are fully initialized. Fixes oss-fuzz 7543 "graphicsmagick/coder_SGI_fuzzer: Use-of-uninitialized-value in SGIEncode". (Credit to OSS-Fuzz).
> - coders/xcf.c (ReadXCFImage): Restore SetImage() which was previously commented out. This is needed to assure initialized pixels. Fixes oss-fuzz 7430 "graphicsmagick/coder_XCF_fuzzer: Use-of-uninitialized-value in AlphaCompositePixel". (Credit to OSS-Fuzz).
> - coders/pict.c (ReadPICTImage): Properly initialize "black canvas" that tiles may be composed on. Fixes oss-fuzz 7574 "graphicsmagick/enhance_fuzzer: Use-of-uninitialized-value in EnhanceImage". (Credit to OSS-Fuzz).
> - coders/rle.c (ReadRLEImage): Check for EOF when reading comment. Fixes oss-fuzz 7667 "graphicsmagick/coder_RLE_fuzzer: Use-of-uninitialized-value in ReadRLEImage". (Credit to OSS-Fuzz).
> - coders/pdb.c (WritePDBImage): Avoid use of uninitialized bytes. Fixes oss-fuzz 7638 "graphicsmagick/coder_PDB_fuzzer: Use-of-uninitialized-value in WritePDBImage". (Credit to OSS-Fuzz).
> - coders/rla.c (ReadRLAImage): Add many more validations, including scanline offsets and number of channels. Fixes oss-fuzz 7653 "graphicsmagick/coder_RLA_fuzzer: Timeout in graphicsmagick_coder_RLA_fuzzer". (Credit to OSS-Fuzz).
> - coders/txt.c (ReadTXTImage): Implement missing subrange logic to read only the specified range of frames. Limits frames read from oss-fuzz test case clusterfuzz-testcase-minimized-coder_TEXT_fuzzer-6061076048248832 "graphicsmagick/coder_TEXT_fuzzer: Timeout in graphicsmagick_coder_TEXT_fuzzer". (Credit to OSS-Fuzz).
> - Magick++/lib/Image.cpp (read): Set subrange = 1 since this interface is intended to read just one frame from the input file. Use the STL-based interfaces to read multiple frames.
> - coders/fits.c (ReadFITSImage): Verify FITS header before reading further. Rejects file from oss-fuzz 7650 "graphicsmagick/coder_FITS_fuzzer: Out-of-memory in graphicsmagick_coder_FITS_fuzzer". (Credit to OSS-Fuzz).
> - PerlMagick/Magick.xs (Get): Fix PerlMagick compilation problem due to rename/repurposing of image->clip_mask.

2018-04-13 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/image.c, magick/image.h: In order to be able to support SVG masks, and to be able to further extend the Image data structure without changing its size, new data structure ImageExtra (struct _ImageExtra) has been added. Header file image.h contains only a forward declaration; the members of ImageExtra are defined in file image.c. Image member variable Image * clip_mask has been replaced by ImageExtra * extra, and function prototypes that enable access to ImageExtra have been added to image.h. The clip_mask member variable now resides in ImageExtra. All references to Image::clip_mask in the GraphicsMagick source code have either been replaced with direct references to ImageExtra::clip_mask (image.c), or have been replaced with calls to access function ImageGetClipMask().
> - magick/render.c, magick/render.h: In order to be able to support SVG masks, and to be able to further extend the DrawInfo data structure without changing its size, new data structure DrawInfoExtra (struct _DrawInfoExtra) has been added. Header file render.h contains only a forward declaration; the members of DrawInfoExtra are defined in file render.c. DrawInfo member variable char * clip_path has been replaced by DrawInfoExtra * extra, and function prototypes that enable access to DrawInfoExtra have been added to render.h. The clip_path member variable now resides in ImageExtra. All references to DrawInfo::clip_path in the GraphicsMagick source code have either been replaced with direct references to DrawInfoExtra::clip_path (render.c), or have been replaced with calls to access function DrawInfoGetClipPath().
> - magick/image.c (new functions CompositePathImage, CompositeMaskImage, GetImageCompositeMask, SetImageCompositeMask): Defined new data structure ImageExtra, added create/destroy logic, and implemented associated access functions. Implemented SVG masks.
> - magick/render.c (DrawImage, new function DrawCompositeMask): Defined new data structure DrawInfoExtra, added create/destroy logic, and implemented associated access functions. Impemented SVG masks.
> - magick/pixel_cache.c (SyncCacheNexus, new function CompositeCacheNexus): Fixed references to Image::clip_mask. Implemented SVG masks.
> - coders/svg.c (SVGStartElement, SVGEndElement): Implemented SVG masks.
> - locale/c.mgk, magick/gm_messages.mc, magick/local_c.h: Added new error codes to support SVG masks.
> - coders/ps3.c, magick/enhance.c: Fixed references to Image::clip_mask.
> - magick/draw.c, wand/drawing_wand.c: Fixed references to DrawInfo::clip_path.

2018-04-13 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/wpg.c Crash on row overflow fixed oss-fuzz 7639 thanks to oss-fuzz.

2018-04-11 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dpx.c (ReadDPXImage): Add more header validations. Always assure that scanline is initialized for Luma channel. Fixes oss-fuzz 7544 "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in WriteDPXImage". (Credit to OSS-Fuzz)
> - coders/pdb.c (ReadPDBImage): Add more EOF checks to avoid benign use of uninitialized data. Fixes oss-fuzz 7545 "graphicsmagick/coder_PDB_fuzzer: Use-of-uninitialized-value in ReadPDBImage".
> - coders/wpg.c (InsertRow, UnpackWPGRaster): x & y should be 'unsigned long' to match type used by pixel cache APIs and image rows/columns.

2018-04-08 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/wpg.c Stop reading when last row is reached. This should stop oss-fuzz 7528 thanks to oss-fuzz.

2018-04-10 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/xcf.c (ReadXCFImage): Fix use of uninitialized data in magick header string for runt file. Fixes oss-fuzz 7521 "graphicsmagick/coder_XCF_fuzzer: Use-of-uninitialized-value in LocaleNCompare". (Credit to OSS-Fuzz).

2018-04-09 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - OVERVIEW: Change set 9aaeeca0224c modified the drawing of clipping paths to conform to the SVG spec. This change set restores the previous behavior for non-SVG clients of render.c, while still satisfying the SVG spec for SVG clients.
> - magick/render.h (DrawInfo): Added a bit field in member "flags" to indicate that drawing should be SVG compliant.
> - magick/render.c (DrawImage): Now recognizes keyword "svg-compliant", and tags DrawInfo accordingly. This allows for existing features in render.c to be changed to comply with the SVG spec without impacting the previous behavior expected by non-SVG clients.
> - magick/render.c (DrawImage): Now uses DrawInfo "flags" bit for SVG compliance in conjunction with "flags" bit for "clipping path" to determine when to ignore changes to fill color, stroke color, etc. This restores the previous behavior for clipping paths for non-SVG clients.
> - coders/svg.c (SVGStartElement): The initial set of MVG commands for rendering an SVG file now includes new keyword "svg-compliant" (to indicate that certain graphical elements should be drawn according to the SVG spec), and includes an intialization of the SVG "fill-rule" to "nonzero" (the SVG default) instead of the internally initialized value of "evenodd".
> - coders/wpg.c: Fixed C99 "//" comments.

2018-04-08 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pict.c (ReadPICTImage): Copy tile exception info to main image and don't composite tile if it has a problem. Fixes oss-fuzz 7169 "graphicsmagick/enhance_fuzzer: Use-of-uninitialized-value in EnhanceImage". (Credit to OSS-Fuzz)
> - coders/dib.c (ReadDIBImage): Do not increase decode bits/pixel if compression=2, but use it to increase pixel packet size when estimating bytes per line for decode buffer. Fixes oss-fuzz issue 7324 "graphicsmagick/coder_WPG_fuzzer: Use-of-uninitialized-value in ReadDIBImage". (Credit to OSS-Fuzz)
> - coders/dpx.c (ReadDPXImage): When handling the first element of a planar DPX, assure that the other channels are initialized. Fixes oss-fuzz 7841 "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in WriteDPXImage". (Credit to OSS-Fuzz)
> - coders/tim.c (ReadTIMImage): Only 4 and 8 bit TIM requires a colormap. For other depths, force reading as DirectClass even if the TIM file provides a colormap. Fixes oss-fuzz 7407 "graphicsmagick/coder_TIM_fuzzer: Use-of-uninitialized-value in SyncImageCallBack". (Credit to OSS-Fuzz)

2018-04-08 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c The unread data contains crap in memory, erase current image data. This should mute oss-fuzz 6604.
> - coders/wpg.c - condition "if(y<1) continue;" is redundant and could be removed completely. Allow logging in MatlabV4 module.
> - coders/svg.c - Do not use C++ syntax in C code - removed.

2018-04-07 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/wpg.c (UnpackWPGRaster): Fix uninitialized row 0 when row-based RLE is used. Fixes oss-fuzz 6603 "graphicsmagick/enhance_fuzzer: Use-of-uninitialized-value in BlendCompositePixel". (Credit to OSS-Fuzz)
> - coders/pcd.c: Fix many issues, including oss-fuzz 6016 "graphicsmagick/coder_PCD_fuzzer: Heap-double-free in MagickRealloc" and oss-fuzz 6108 "graphicsmagick/coder_PCD_fuzzer: Unknown signal in AllocateThreadViewDataSet". (Credit to OSS-Fuzz)

2018-04-06 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dcm.c (funcDCM_BitsStored): Limit DICOM significant bits to 16. Otherwise rescale map code blows up. Fixes oss-fuzz 7435 "graphicsmagick/coder_DCM_fuzzer: Out-of-memory in graphicsmagick_coder_DCM_fuzzer". (Credit to OSS-Fuzz)
> - coders/pix.c (ReadPIXImage): Detect EOF. Reject RLE lenth of zero. Fixes oss-fuzz 7440 "graphicsmagick/coder_PIX_fuzzer: Out-of-memory in graphicsmagick_coder_PIX_fuzzer". (Credit to OSS-Fuzz)

2018-04-05 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dpx.c (ReadDPXImage): Insist on having an element descriptor we understand since otherwise we can not decode the image. Fixes oss-fuzz 7410 "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in WriteDPXImage". (Credit to OSS-Fuzz)
> - coders/avs.c, etc... (WriteAVSImage): Cache image list length before writing image sequence so that progress monitor is scalable. Helps with oss-fuzz 7404 "graphicsmagick/coder_AVS_fuzzer: Timeout in graphicsmagick_coder_AVS_fuzzer". (Credit to OSS-Fuzz)

2018-04-05 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement, SVGEndElement), magick/render.c (DrawImage): The current text position is now maintained by DrawImage() instead of by SVGStartElement() and SVGEndElement(). This change was made to support the recently implmemented "use" and "class" elements, which may make changes to the font size that are not visible to the code in svg.c.
> - coders/svg.c (GetStyleTokens, SVGStartElement): The list of SVG attributes is now reordered so that "font-size", "class", and "style" are processed first. This ensures that a change to the font size will be processed before any dimensional attribute whose value may depend on the font size (e.g., a width value specified in "em" units).
> - coders/svg.c (ProcessStyleClassDefs): Fixed two memory leaks associated with making an early return when malformed input is detected.
> - magick/render.c (ExtractTokensBetweenPushPop): Fixed an uninitialized variable condition which can occur when malformed input is detected.
> - magick/render.h (DrawInfo), magick/render.c: DrawInfo member "unused1" has been renamed "flags". It is now used to tag a DrawInfo as being a clipping path or a compositing mask.

2018-04-04 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pdb.c (ReadPDBImage): Update DirectClass pixels to avoid use of uninitialized memory for 2 bits/pixel. Fixes oss-fuzz 7350 "graphicsmagick/coder_PDB_fuzzer: Use-of-uninitialized-value in WritePDBImage". (Credit to OSS-Fuzz)
> - coders/palm.c (ReadPALMImage): Fix use of uninitialized memory. Fixes oss-fuzz 7325 "graphicsmagick/coder_PALM_fuzzer: Use-of-uninitialized-value in TransparentImageCallBack". (Credit to OSS-Fuzz)
> - coders/dcm.c (DCM_ReadNonNativeImages): Break out of reading loop on EOF and properly report exception. Fixes oss-fuzz 7349 "graphicsmagick/coder_DCM_fuzzer: Timeout in graphicsmagick_coder_DCM_fuzzer". (Credit to OSS-Fuzz)

2018-04-03 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/xcf.c (ReadXCFImage): Require that XCF file offsets be in ascending order to avoid DOS. Fixes oss-fuzz 7333 "graphicsmagick/coder_XCF_fuzzer: Out-of-memory in graphicsmagick_coder_XCF_fuzzer". (Credit to OSS-Fuzz)
> - coders/wpg.c (UnpackWPGRaster): Fix memory leak in error return path. Fixes oss-fuzz 7338 "graphicsmagick/enhance_fuzzer: Direct-leak in UnpackWPGRaster". (Credit to OSS-Fuzz)

2018-04-03 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement): This changeset adds support for SVG geometric transforms specified using the style="transform: ..." syntax. This syntax is sometimes used when exporting SVG files from Adobe Illustrator.

2018-04-02 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dpx.c (ReadDPXImage): Validate DPX packing method. Fixes oss-fuzz 7296 "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in WriteDPXImage". (Credit to OSS-Fuzz)

2018-04-02 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement, SVGEndElement), magick/render.c (DrawImage): This changeset adds support for "class" styling attributes within a <style> section within the <defs> section, and the ability to reference them from other SVG elements by class="classname". SVG files exported from Adobe Illustrator make extensive use of "class" definitions.

2018-04-01 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pict.c (ReadPICTImage): Fix leak of tile image on EOF. This is a recent regression. Fixes oss-fuzz 7287 "graphicsmagick/coder_PCT_fuzzer: Indirect-leak in CloneImage". (Credit to OSS-Fuzz)
> - magick/pixel_cache.c (OpenCache): Use image->scene rather than GetImageIndexInList(image) for scene-id part of cache info file name.
> - coders/txt.c (WriteTXTImage): Optimize the progress indicator since it is very inefficient with a large number of scenes and oss-fuzz 7090 "graphicsmagick/coder_TEXT_fuzzer: Timeout in graphicsmagick_coder_TEXT_fuzzer" consistently shows GetImageListLength() in its stack traces.
> - coders/dcm.c (ReadDCMImage): DICOM reader was no longer immediately quitting with excessive samples per pixel. This caused spinning for a very long time when reading planar images with large samples per pixel. This is a regression due to recent changes. Fixes oss-fuzz 7269 "graphicsmagick/coder_DCM_fuzzer: Timeout in graphicsmagick_coder_DCM_fuzzer". (Credit to OSS-Fuzz)
> - coders/xcf.c (ReadXCFImage): Destroy layer info before returning due to exception. This is a new regression due to adding more checks. Fixes oss-fuzz 7277 "graphicsmagick/coder_XCF_fuzzer: Direct-leak in ReadXCFImage". (Credit to OSS-Fuzz)
> - coders/pdb.c (ReadPDBImage): Assure that all bytes of scanline are initialized while decoding. Fixes oss-fuzz 7051 "graphicsmagick/coder_PDB_fuzzer: Use-of-uninitialized-value in WritePDBImage". (Credit to OSS-Fuzz)

2018-03-31 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pcx.c (ReadPCXImage): Assure that scanline is initialized. Fixes oss-fuzz 6612 "graphicsmagick/coder_PCX_fuzzer: Use-of-uninitialized-value in WriteRLEPixels". (Credit to OSS-Fuzz)
> - coders/wpg.c (ReadWPGImage): Detect unexpected EOF and avoid use of uninitialized data. Fixes oss-fuzz 6601 "graphicsmagick/enhance_fuzzer: Use-of-uninitialized-value in ImportIndexQuantumType". (Credit to OSS-Fuzz)
> - coders/sgi.c (ReadSGIImage): Assure that RLE decode buffer is initialized. Fixes oss-fuzz 6599 "graphicsmagick/coder_SGI_fuzzer: Use-of-uninitialized-value in SyncImageCallBack" and oss-fuzz 6600 "graphicsmagick/coder_SGI_fuzzer: Use-of-uninitialized-value in SGIEncode". (Credit to OSS-Fuzz)
> - coders/viff.c (ReadVIFFImage): Fix blob I/O size validation to avoid use of uninitialized data. Fixes oss-fuzz 6597 "graphicsmagick/coder_VIFF_fuzzer: Use-of-uninitialized-value in ThresholdImage". (Credit to OSS-Fuzz) (ReadVIFFImage): Don't execute SetImageType(image,BilevelType) on an image which has no pixels yet in order to avoid use of uninitialized data. Fixes oss-fuzz 6597. (Credit to OSS-Fuzz)
> - coders/wbmp.c (ReadWBMPImage): Fix blob I/O size validation to avoid use of uninitialized data. Fixes oss-fuzz 7047 "graphicsmagick/coder_WBMP_fuzzer: Use-of-uninitialized-value in ReadWBMPImage". (Credit to OSS-Fuzz)
> - coders/wpg.c (ExtractPostscript): Allow non-Postscript content but force reading using the magick we already detected. Also log the format that we detected.
> - coders/xcf.c (ReadOneLayer): Reject layer size of 0x0. Fixes oss-fuzz 6636 "graphicsmagick/coder_XCF_fuzzer: Direct-leak in MagickMallocAligned". (Credit to OSS-Fuzz) (ReadXCFImage): Verify that seek offsets are within the bounds of the file data. Fixes oss-fuzz 6682 "graphicsmagick/coder_XCF_fuzzer: Out-of-memory in graphicsmagick_coder_XCF_fuzzer". (Credit to OSS-Fuzz)
> - magick/pixel_cache.c (ModifyCache): Destroy CacheInfo if OpenCache() fails so it is not leaked.
> - coders/wpg.c (ExtractPostscript): Enforce that embedded file is a Postscript file. Fixes oss-fuzz 7235 "graphicsmagick/coder_WPG_fuzzer: Indirect-leak in MagickRealloc". This is indicated to be a regression. (Credit to OSS-Fuzz)

2018-03-30 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pict.c (ReadPICTImage): Check image pixel limits before allocating memory for tile. Fixes oss-fuzz 7217 "graphicsmagick/coder_PICT_fuzzer: Out-of-memory in graphicsmagick_coder_PICT_fuzzer".

2018-03-29 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pcd.c (ReadPCDImage): Add checks for EOF. Fixes oss-fuzz issue 7180 "graphicsmagick/coder_PCDS_fuzzer: Timeout in graphicsmagick_coder_PCDS_fuzzer". (Credit to OSS-Fuzz)

2018-03-29 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement, SVGEndElement), magick/render.c (DrawImage): This changeset implements the SVG "use" element. Graphical elements (e.g., "rect", "text", etc.) can be tagged with an identifier using 'id="identifier"' when defined within the "defs" section. They can then be referenced elsewhere in the SVG file using:

>   <use xlink:href="#identifier" ... />

>   When referencing a graphical element by its identifier, the following syntaxes are now treated as being the same:

>   href="#identifier" href="url(#identifier)" xlink:href="#identifier" xlink:href="url(#identifier)"

2018-03-27 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/tim.c (ReadTIMImage): Reader was not observing subimage and subrange to quit after the specified frame range. Inspired by oss-fuzz 7132 "graphicsmagick/coder_TIM_fuzzer: Timeout in graphicsmagick_coder_TIM_fuzzer" (Credit to OSS-Fuzz)

2018-03-27 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement): Enable setting the background color from the SVG file when the client specifies style="background:color" inside the <svg> ... </svg> element.

2018-03-25 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/mtv.c (ReadMTVImage): Add some elementary tracing to MTV reader.
> - coders/png.c (ReadMNGImage): Fix SourceForge issue 554 "Divide-by-zero in ReadMNGImage (coders/png.c)". (Credit to Trace Probe)
> - coders/bmp.c (ReadBMPImage): Assure that start position always advances to avoid looping BMPs. Fixes oss-fuzz 7045 "graphicsmagick/coder_BMP_fuzzer: Timeout in graphicsmagick_coder_BMP_fuzzer". (Credit to OSS-Fuzz)
> - coders/pict.c (DecodeImage): Verify that sufficient backing data exists before allocating memory to read it. Fixes oss-fuzz 6629 "graphicsmagick/coder_PCT_fuzzer: Out-of-memory in graphicsmagick_coder_PCT_fuzzer". (ReadPICTImage): Destroy tile_image in ThrowPICTReaderException() macro to simplify logic.

2018-03-25 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c Check whether datablock is really read. Fixes oss-fuzz 7056 (Credit to OSS-Fuzz)
> - coders/txt.c Duplicate image check for data with fixed geometry previous check is skipped. Fixes oss-fuzz 7090.

2018-03-24 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dcm.c (ReadDCMImage): Validate that samples per pixel is in valid range. Fixes oss-fuzz 6260 "graphicsmagick/coder_DCM_fuzzer: Out-of-memory in graphicsmagick_coder_DCM_fuzzer". (Credit to OSS-Fuzz)
> - coders/meta.c (format8BIM): Allocate space for null termination and null terminate string. Fixes oss-fuzz 5985 "graphicsmagick/coder_8BIMTEXT_fuzzer: Heap-buffer-overflow in formatIPTCfromBuffer". (Credit to OSS-Fuzz)
> - coders/fits.c (ReadFITSImage): Include number of FITS scenes in file size validations. Fixes oss-fuzz 6781 "graphicsmagick/coder_FITS_fuzzer: Timeout in graphicsmagick_coder_FITS_fuzzer". (Credit to OSS-Fuzz)

2018-03-23 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/meta.c (format8BIM): Validate size request prior to allocation. Fixes oss-fuzz issue 5974 "graphicsmagick/coder_8BIMTEXT_fuzzer: Out-of-memory in graphicsmagick_coder_8BIMTEXT_fuzzer". (Credit to OSS-Fuzz)

2018-03-23 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c Fix forged amount of frames 7076. (Credit to OSS-Fuzz)

>   > * coders/topol.c Check for forged image that overflows file size (fuzz 6836).

2018-03-23 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c, render.h (DrawInfo, CloneDrawInfo, DrawClipPath, DrawImage, GetDrawInfo): According to the SVG spec, a clipping path is defined only by the geometry of its constituent elements, and is not dependent on fill color/opacity, stroke color/opacity, or stroke width. To ensure conformity with the spec, when a clipping path is created, these SVG elements are set to appropriate values, and any attempt to modify them is ignored.

>   Also, whenever a clipping path is drawn, the associated image attributes are now updated from the parent image structure. This ensures that any added or modified attributes are up to date.

2018-03-22 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/topol.c Use rather MagickSwabArrayOfUInt32() to

>     flip all array elements at once.

>     * magick/annotate.c Compilation issue - using C++ syntax in C code.

2018-03-20 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dpx.c (ReadDPXImage): Validate header length and offset properties. Fixes oss-fuzz "graphicsmagick/coder_DPX_fuzzer: Use-of-uninitialized-value in WriteDPXImage". (Credit to OSS-Fuzz)

2018-03-20 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/annotate.c (RenderType): According to the SVG spec, the 'font-family' element can be a comma-separated list of one or more font family names. Function RenderType in file annotate.c has been modified to support multiple font family names as follows. The comma-separated list is processed until the first available font family is found. If no font family is found, or if font substitution occurred, then the entire font family string is tested to see if it exactly matches a font name, or if the font family string with blanks changed to hypens exactly matches a font name. If a font name match is found, the matched font overrides the font substution. The font name matching functionality is beyond what's in the SVG spec and is provided as a convenience to the user.

2018-03-20 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c Fix forged amount of frames 6755. (Credit to OSS-Fuzz)

2018-03-20 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/topol.c Redesign ReadBlobDwordLSB() to be more effective.

2018-03-19 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/xpm.c (ReadXPMImage): Reject XPM if its condensed version contains non-whitespace control characters. Fixes oss-fuzz 7027 "graphicsmagick/coder_XPM_fuzzer: Timeout in graphicsmagick_coder_XPM_fuzzer". (Credit to OSS-Fuzz)

2018-03-19 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/topol.c Fix tile index overflow fuzz 6634. (Credit to OSS-Fuzz)

2018-03-19 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dcm.c (DCM_ReadGrayscaleImage): Don't use rescale map if it was not allocated. This issue was induced in this development cycle due to disabling generating the rescale map. Fixes oss-fuzz 7021 "graphicsmagick/coder_DCM_fuzzer: Null-dereference READ in DCM_ReadGrayscaleImage". (Credit to OSS-Fuzz)

2018-03-18 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/color_lookup.c (QueryColorDatabase): Defend against partial scanf() expression matching, resulting in use of uninitialized data. Likely fixes oss-fuzz 6596 "graphicsmagick/coder_XPM_fuzzer: Use-of-uninitialized-value in IsMonochromeImage". (Credit to OSS-Fuzz)
> - coders/rle.c (ReadRLEImage): Validate number of colormap bits to avoid undefined shift behavior. Fixes oss-fuzz 6630 "graphicsmagick/enhance_fuzzer: Undefined-shift in ReadRLEImage". (Credit to OSS-Fuzz)
> - coders/dcm.c (DCM_ReadRGBImage): Don't use rescale map if it was not allocated. This issue was induced in this development cycle due to disabling generating the rescale map. Fixes oss-fuzz 6995 "graphicsmagick/coder_DCM_fuzzer: Null-dereference READ in DCM_ReadRGBImage". (Credit to OSS-Fuzz)
> - coders/dib.c (DecodeImage): Report failure to decode to expected amount of pixel data as an error. Fixes oss-fuzz 7007 "graphicsmagick/enhance_fuzzer: Use-of-uninitialized-value in EnhanceImage". (Credit to OSS-Fuzz)
> - coders/bmp.c (ReadBMPImage): Add file size and offset/seek validations. Fixes oss-fuzz 6623 "graphicsmagick/coder_BMP_fuzzer: Timeout in graphicsmagick_coder_BMP_fuzzer". (Credit to OSS-Fuzz)

2018-03-17 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - dcraw/dcraw.c Updated to version 9.27

2018-03-15 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/gif.c (ReadGIFImage): Fix botched fixes for use of uninitialized data when reading GIF extension blocks. Hopefully ok now.

2018-03-13 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/gif.c (ReadGIFImage): Fix use of uninitialized data when reading GIF extension blocks. Fixes oss-fuzz 6609 "graphicsmagick/coder_GIF_fuzzer: Use-of-uninitialized-value in MagickArraySize". This seems to be a totally benign issue. (Credit to OSS-Fuzz)
> - magick/magick.c (MagickSignal): Use an alternate signal stack, if available. This is required for Go lang C language extensions since Go lang requests an alternate signal sack, and uses small stacks for its threads. If the library user has not allocated an alternate signal stack, then behavior should be just as before. Issue was originally reported by yzh杨振宏 on March 1, 2018 via the graphicsmagick-help SourceForge mailing list.

2018-02-28 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/pixel_cache.c (AcquireCacheNexus): Add a check that the pixel cache is compatible with the image dimensions. Fixes oss-fuzz issues 5978 5988 5989 5990 5993 6016, and 6056, which are all related to the PICT writer. (Credit to OSS-Fuzz)
> - magick/draw.c (DrawGetStrokeDashArray): Check for failure to allocate memory. Patch submited by Petr Gajdos via email on February 28, 2018.

2018-02-27 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/fits.c (ReadFITSImage): Fix signed integer overflow when computing pixels size. Fixes oss-fuzz 6586 "graphicsmagick/coder_FITS_fuzzer: Integer-overflow in ReadFITSImage". (Credit to OSS-Fuzz)

2018-02-27 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement, SVGEndElement): From the SVG spec: "The 'foreignObject' element allows for inclusion of a foreign namespace which has its graphical content drawn by a different user agent." Code has been added to consume and discard the 'foreignObject' element and any settings (e.g., fill color) internal to it. Previously, settings internal to the 'foreignObject' element would persist and "leak" into the graphic elements that followed it, resulting in undesired side effects (e.g., fill color other than the expected default).

2018-02-27 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (DrawPolygonPrimitive): Fixed a bug introduced by changeset 39102dd1d456. For SVG, this changeset applied both the group AND the fill opacity values to fill patterns (similarly for stroke). For WMF, however, this caused the fill pattern to be rendered as 100% transparent. A closer reading of the SVG spec does NOT show that the fill opacity should be applied to the fill pattern, so as of this latest changeset only the group opacity value is applied to fill and stroke patterns.

2018-02-27 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/bmp.c (ReadBMPImage): Fix divide by zero regression added by latest fixes. Fixes oss-fuzz 6583 "graphicsmagick/coder_BMP_fuzzer: Divide-by-zero in ReadBMPImage". (Credit to OSS-Fuzz)

2018-02-26 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pict.c (ReadPICTImage): Validate that PICT rectangles do not have zero dimensions. Specify expected file type when reading from a temporary file. Trace PICT rectangle dimensions. More detection of blob EOF and more error handling. Fixes oss-fuzz issue 6193 "graphicsmagick/coder_PCT_fuzzer: Unknown signal in AllocateImageColormap" and likely many oss-fuzz ASAN/UBSAN issues reported against "PCT" and "PICT" since this one problem appears to be causing a spew of reports.
> - coders/png.c (ReadMNGImage): Detect and handle failure to allocate global PLTE. Problem was reported via email from Petr Gajdos on February 26, 2018.

2018-02-25 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/blob.c (ReadBlobLSBDouble): Make sure imported double is a normal value. (ReadBlobLSBDoubles): Make sure imported doubles are normal values. (ReadBlobLSBFloat): Make sure imported float is a normal value. (ReadBlobLSBFloats): Make sure imported floats are normal values. (ReadBlobMSBFloat): Make sure imported float is a normal value. (ReadBlobMSBFloats): Make sure imported floats are normal values. (ReadBlobMSBDouble): Make sure imported double is a normal value. (ReadBlobMSBDoubles): Make sure imported doubles are normal values.
> - magick/import.c (ImportFloat32Quantum): Make sure imported float is a normal value. (ImportFloat64Quantum): Make sure imported double is a normal value.
> - magick/image.h (RoundDoubleToQuantum): Restore previous behavior (from earlier today). (RoundFloatToQuantum): Restore previous behavior (from earlier today).
> - coders/bmp.c (ReadBMPImage): Fix UBSAN runtime error: left shift of 205 by 24 places cannot be represented in type 'int'.
> - coders/ept.c (ReadEPTImage): Fix dereference of NULL pointer which was detected by UBSAN in the test suite.
> - magick/image.h (RoundDoubleToQuantum): Check double value for NaN and infinity in order to avoid undefined behavior. (RoundFloatToQuantum): Check float value for NaN and infinity in order to avoid undefined behavior.
> - magick/common.h (MAGICK_ISNAN): Add a isnan() wrapper macro. (MAGICK_ISINF): Add a isinf() wrapper macro.

2018-02-25 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c Fix oss-fuzz issue 6273 - Heap-use-after-free in GetLocaleExceptionMessage. (Credit to OSS-Fuzz)

2018-02-24 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dcm.c (DCM_PostRescaleImage): Remove use of DCM_PostRescaleImage() since its implementation is wrong and accesses non-allocated heap memory. Problem was reported by Petr Gajdos via email on February 8, 2018.
> - coders/jp2.c (ReadJP2Image): Use a ThrowJP2ReaderException macro to automatically clean up when throwing an exception.
> - coders/bmp.c (ReadBMPImage): Report an error if RLE decode does not produce the expected number of bytes. Fixes oss-fuzz issue 6015 "graphicsmagick/coder_BMP_fuzzer: Out-of-memory in graphicsmagick_coder_BMP_fuzzer". (Credit to OSS-Fuzz)

2018-02-23 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (DrawImage): Fixed a bug in which graphical elements defined within <defs> ... </defs> were being rendered, contrary to the SVG spec.

2018-02-23 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (DrawPolygonPrimitive): When filling or stroking a polygon using a pattern, the fill (or stroke) and group/object opacity values were not being applied to the pattern (fixed).

2018-02-23 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/bmp.c (ReadBMPImage): Fix SeekBlob() return value checks. Add more EOF checks. Require that a provided ba_offset be a forward seek in order to avoid the possibility of endless looping.

2018-02-23 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c Fix oss-fuzz issue 6301. (Credit to OSS-Fuzz)

2018-02-22 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/alpha_composite.c (BlendQuantumOpacity): The pixel compositing equation used when compositing an image into the output was incorrect and has been fixed.
> - magick/render.c (DrawPolygonPrimitive): When compositing polygon edge pixels over a transparent black background, the code would composite as if the background were opaque black, resulting in the edge pixels being too dark (fixed).

2018-02-21 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (DrawImage): Per the SVG spec, opacity, fill-opacity, and stroke-opacity values are now clamped to [0,1].

>   Also fixed two bugs introduced by changeset 91de8039f27d (dated 2018-02-12): (1) a group/object opacity value specified using a percentage was not being converted to a value in [0,1]; (2) if fill-opacity or stroke-opacity was 1, and the group/object opacity value was set to 1, the resulting fill-opacity or stroke-opacity value would be set to 0 instead of 1.

2018-02-19 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/viff.c (ReadVIFFImage): Fix excessive memory usage. Fixes oss-fuzz 6006 "graphicsmagick/coder_XV_fuzzer: Out-of-memory in graphicsmagick_coder_XV_fuzzer". (Credit to OSS-Fuzz)
> - coders/txt.c (ReadInt): Avoid benign signed integer overflow due to accepting an arbitrary number of digits. Fixes oss-fuzz 6002 "graphicsmagick/coder_TEXT_fuzzer: Integer-overflow in ReadInt". (Credit to OSS-Fuzz)
> - coders/viff.c (ReadVIFFImage): Verify that there is sufficient data to back up colormap allocation request. Fixes oss-fuzz 5986 "graphicsmagick/coder_VIFF_fuzzer: Out-of-memory in graphicsmagick_coder_VIFF_fuzzer". (Credit to OSS-Fuzz)
> - magick/memory.c: Define MAGICK_MEMORY_HARD_LIMIT=value to abort when memory request exceeds value. Useful to find location of excessive memory requests.

2018-02-19 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement): Per the SVG spec, the SVG coder now initializes the MVG coder (which renders SVG graphical elements) with the the SVG defaults for fill color, fill-opacity, stroke color, stroke-opacity, and stroke-width. This makes the SVG coder independent of the MVG coder intial state.

2018-02-19 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement): Fixed initialization of x and y attributes per the SVG spec: for graphical elements "image", "pattern", "text", "rect", and "use", if the x or y attribute is not specified, the effect is as if a value of "0" were specified.

2018-02-18 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/sun.c (ReadSUNImage): Fix edge case which broke file-size validation logic. Fixes oss-fuzz issue 5981 "graphicsmagick/coder_SUN_fuzzer: Out-of-memory in graphicsmagick_coder_SUN_fuzzer". (Credit to OSS-Fuzz)
> - coders/txt.c (ReadTXTImage): Validate that file size is sufficient for claimed image properties. Fixes oss-fuzz issue 5960 "graphicsmagick/coder_TXT_fuzzer: Out-of-memory in graphicsmagick_coder_TXT_fuzzer". (Credit to OSS-Fuzz)
> - coders/tga.c (ReadTGAImage): Only allow 1 and 8 bit colormapped/grey images. Fixes oss-fuzz issue 6314 "graphicsmagick/coder_ICB_fuzzer: Undefined-shift in ReadTGAImage". (Credit to OSS-Fuzz)
> - coders/bmp.c (ReadBMPImage): Detect and report when BMP height value is out of range (too negative). Fixes oss-fuzz issue 6394 "graphicsmagick/coder_BMP_fuzzer: Integer-overflow in ReadBMPImage". (Credit to OSS-Fuzz)
> - coders/rla.c (ReadRLAImage): Detect when RLE decoding is producing too many samples and report as an error. Fixes oss-fuzz issue 6312 "graphicsmagick/coder_RLA_fuzzer: Timeout in graphicsmagick_coder_RLA_fuzzer". (Credit to OSS-Fuzz)
> - coders/fits.c (ReadFITSImage): Validate that file size is sufficient for claimed image properties. Fixes oss-fuzz issue 6429 "graphicsmagick/coder_FITS_fuzzer: Timeout in graphicsmagick_coder_FITS_fuzzer". (Credit to OSS-Fuzz)
> - magick/image.c (CloneImage): Check image pixel limits in CloneImage() when it is used to change the image dimensions. This avoids depending on the using code to detect and report such issues.
> - coders/xcf.c (ReadXCFImage): Check image pixel limits after each CloneImage() to assure that image is within specified resource limits. Fixes oss-fuzz issue 6399 "graphicsmagick/enhance_fuzzer: Timeout in graphicsmagick_enhance_fuzzer". (Credit to OSS-Fuzz)

2018-02-16 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (TracePath): TracePath() was not correctly processing multiple sets of cubic or quadratic Bezier coordinates when the previous path data command was not a cubic or quadratic Bezier command. This would result in the first control point being equal to the current path point instead of being computed using the current path point and the second control point of the previous Bezier command.

2018-02-15 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (TracePath): TracePath() was not consuming commas (if present) at the end of a set of points when multiple sets of points were specified for various path commands (e.g., line, Bezier). This resulted in the remaining sets of points being ignored (fixed).

2018-02-15 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (TraceArcPath): No points are generated by TraceArcPath() if the starting and ending arc points are the same. For this case, the coordinate count was not being set to zero before returning (fixed).

2018-02-15 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (DrawImage): Clipping of polygons in DrawImage() would sometime result in a starting pixel location that was greater than the ending pixel location, causing a subsequent call to GetImagePixelsEx() to fail due a column count <= 0. Modified the clipping code to eliminate this condition, and also to return early if the polygon lies completely outside the image boundaries. Also fixed variable declarations from a previous commit that were causing problems for the C89 compiler.

2018-02-13 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/topol.c (ReadTOPOLImage): Detect EOF immediately rather than spinning. Fixes oss-fuzz issue 6303 "graphicsmagick/coder_TOPOL_fuzzer: Timeout in graphicsmagick_coder_TOPOL_fuzzer". (Credit to OSS-Fuzz)
> - coders/dcm.c (DCM_SetupRescaleMap): Avoid excessive left shift. Fixes oss-fuzz issue 6256 "graphicsmagick/coder_DCM_fuzzer: Undefined-shift in DCM_SetupRescaleMap". (Credit to OSS-Fuzz)

2018-02-12 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/wpg.c (ExtractPostscript): Detect EOF on input while transferring bytes to Postscript file. Fixes oss-fuzz issue 6087 "graphicsmagick/coder_WPG_fuzzer: NULL". Later identified to be CVE-2017-17682 as previously discovered in ImageMagick. (Credit to OSS-Fuzz)
> - coders/pdb.c (ReadPDBImage): Quit attempting to read image data immediately at EOF. Fixes oss-fuzz issue 6252 "graphicsmagick/coder_PDB_fuzzer: Timeout in graphicsmagick_coder_PDB_fuzzer". (Credit to OSS-Fuzz)

2018-02-12 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/topol.c (ReadTOPOLImage): Avoid index out of bounds when input filename does not use a file extension. Fixes oss-fuzz issue 6237 "graphicsmagick/coder_TOPOL_fuzzer: Index-out-of-bounds in ReadTOPOLImage". (Credit to OSS-Fuzz)

2018-02-12 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (DrawImage): Object/group opacity, when set in DrawImage(), would overwrite the fill and stroke opacities. This has been fixed so that the object opacity is now combined with the fill and stroke opacities per the SVG spec.

2018-02-12 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/mat.c Fix oss-fuzz issue 6021. (Credit to OSS-Fuzz)

2018-02-11 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dcm.c (ReadDCMImage): Avoid undefined left shift of short. Fix memory leaks in error reporting paths. Fixes oss-fuzz issue 6217 "graphicsmagick/coder_DCM_fuzzer: Undefined-shift in ReadDCMImage". (Credit to OSS-Fuzz)
> - coders/dpx.c (ReadDPXImage): Avoid divide by zero exception in the case where reference high equals reference low. Fixes oss-fuzz issue 6215 "graphicsmagick/coder_DPX_fuzzer: Divide-by-zero in ReadDPXImage". (Credit to OSS-Fuzz)
> - coders/topol.c (ReadTOPOLImage): Avoid index out of bounds when input filename does not use a file extension.
> - coders/cut.c (ReadCUTImage): Avoid index out of bounds when input filename does not use a file extension. Fixes oss-fuzz issue 6218 "graphicsmagick/coder_CUT_fuzzer: Index-out-of-bounds in ReadCUTImage". (Credit to OSS-Fuzz)
> - coders/pwp.c (ReadPWPImage): Force temporary file to be read as a SFW file rather than autodetecting the format. Fixes oss-fuzz issue 6220 "graphicsmagick/coder_PWP_fuzzer: Indirect-leak in AllocateImage". (Credit to OSS-Fuzz)

2018-02-10 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pdf.c (WritePDFImage): Assure that xref memory is not leaked if an exception is thrown. Fixes oss-fuzz issue 5968 "graphicsmagick/coder_EPDF_fuzzer: Direct-leak in MagickRealloc". (Credit to OSS-Fuzz)
> - coders/tim.c (ReadTIMImage): Verify that 4/8 bit PSX TIM provides a CLUT and verify indexes. Fixes oss-fuzz issue 5972 "graphicsmagick/coder_TIM_fuzzer: Null-dereference WRITE in ReadTIMImage". (Credit to OSS-Fuzz)
> - coders/topol.c (ReadTOPOLImage): Add additional header validations. Fixes oss-fuzz issue 5975 "graphicsmagick/coder_TOPOL_fuzzer: Floating-point-exception in ReadTOPOLImage". (Credit to OSS-Fuzz)
> - coders/bmp.c (ReadBMPImage): Avoid possible division by zero when decoding CIE primary values. (Credit to OSS-Fuzz)
> - magick/export.c (ExportViewPixelArea): Only compute unsigned_maxvalue if sample_bits <= 32.
> - magick/import.c (ImportViewPixelArea): Assure that double_maxvalue minus double_minvalue is not zero, or excessively close to zero to avoid divide by zero exception or impossible scaling factor. (Credit to OSS-Fuzz) (ImportViewPixelArea): Only compute unsigned_maxvalue if sample_bits <= 32.

2018-02-09 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dib.c (ReadDIBImage): Validate that image width is not too negative such that it's absolute value can not fit in 32-bit unsigned width. Resolves oss-fuzz issue 6179 "graphicsmagick/coder_ICO_fuzzer: Integer-overflow in ReadDIBImage". (Credit to OSS-Fuzz)
> - coders/dcm.c (funcDCM_BitsStored): Validate DICOM datum size. Use a different means to determine the maximum value which does not use excessive shifting. Resolves oss-fuzz issue 6165 "graphicsmagick/coder_DCM_fuzzer: Undefined-shift in funcDCM_BitsStored". (Credit to OSS-Fuzz)

2018-02-08 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/dpx.c (ReadWordU32BE): Add casts to avoid default type promotion from unsigned char to 'int' leading to undefined behavior for 24 bit shift. Fixes oss-fuzz issue 6058 "graphicsmagick/coder_DPX_fuzzer: Undefined-shift in ReadWordU32BE". (Credit to OSS-Fuzz) (ReadDPXImage): Require that the file has at least one element. Add bountiful casts for values which are left-shifted. Fixes oss-fuzz issue 5962 "graphicsmagick/coder_DPX_fuzzer: Undefined-shift in ReadDPXImage". (Credit to OSS-Fuzz)
> - coders/dcm.c (DCM_ReadOffsetTable): Add casts Add casts to avoid default type promotion from unsigned char to 'int' leading to undefined behavior for 16 bit shift. Fixes oss-fuzz issue 5980 "graphicsmagick/coder_DCM_fuzzer: Undefined-shift in DCM_ReadOffsetTable". (Credit to OSS-Fuzz)
> - magick/module_aliases.h (ModuleAliases): Add missing mapping from "ICODIB" format to "DIB" module.
> - magick/import.c (ImportUInt32Quantum): Add casts to avoid default type promotion from unsigned char to 'int' leading to undefined behavior for 24 bit shift. Fixes oss-fuzz "graphicsmagick/coder_P7_fuzzer: Undefined-shift in ImportRGBQuantumType". (Credit to OSS-Fuzz)

2018-02-07 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/wpg.c Fix oss-fuzz issue 5964 "graphicsmagick/coder_MAT_fuzzer: Heap-use-after-free in GetLocaleExceptionMessage". (Credit to OSS-Fuzz)

2018-02-07 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/render.c (IsPoint): Fixed a bug in which IsPoint() would reject as a valid coordinate value strings that did not begin with an integer: e.g., "0.25" would be accepted, but ".25" would not.

2018-02-07 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/cut.c (ReadCUTImage): Fix DestroyImageInfo() of NULL pointer leading to assertion. Fixes oss-fuzz issue 6067 "graphicsmagick/coder_CUT_fuzzer: Unknown signal in DestroyImageInfo".
> - coders/tga.c (ReadTGAImage): Throw exception rather than assertion for unexpected comment size. Fixes oss-fuzz issue 5961 "graphicsmagick/coder_ICB_fuzzer: ASSERT: (size_t) (tga_info.id_length+1) == commentsize".

2018-02-06 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pdf.c (WritePDFImage): Free 'xref' allocation before error return. Fixes oss-fuzz issue 5968 "graphicsmagick/coder_EPDF_fuzzer: Direct-leak in MagickRealloc".

2018-02-04 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/pdb.c (ReadPDBImage): Fix heap buffer overflow if blob is already at EOF when comment is read. Fixes oss-fuzz issue 5997 "graphicsmagick/coder_PDB_fuzzer: Heap-buffer-overflow in SetImageAttribute".
> - coders/dpx.c (ReadDPXImage): Fix memory leak of user data if user data is truncated. Fix consumption of one uninitialized stack bytes. Fixes oss-fuzz issue 5973: graphicsmagick/enhance_fuzzer: Direct-leak in ReadDPXImage.
> - coders/pnm.c (ReadPNMImage): Detect and avoid division by zero. Fixes Issue 5959 in oss-fuzz: graphicsmagick/coder_P7_fuzzer: Divide-by-zero in ReadPNMImage
> - magick/xwindow.c (MagickXClientMessage): Eliminate valgrind gripe about use of uninitialized stack data by clearing allocation to zero. (MagickXMakeImage): Eliminate valgrind gripe about use of uninitialized heap data by clearing allocation to zero.
> - coders/pwp.c (ReadPWPImage): Remove bogus EOF test on an image with a closed blob. Fixes Issue 5957 in oss-fuzz: graphicsmagick/coder_PWP_fuzzer: ASSERT: image->blob->type != UndefinedStream.
> - www/Changes.rst: Fix typo with spelling "ChangeLog-2017.html". Resolves SourceForge issue #544 "dead link 2017 changelog page on GraphicsMagick web site".

2018-02-03 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/static.c (OpenModule): Assure that status is initialized. Resolves Coverity 261207 "Uninitialized scalar variable".
> - wand/magick_wand.c (MagickHasColormap): New function to test if the image has a colormap. (MagickIsGrayImage): New function to test if the image uses only gray pixels. (MagickIsMonochromeImage): New function to test if the image uses only monochrome pixels. (MagickIsOpaqueImage): New function to test if the image uses only opaque pixels. (MagickIsPaletteImage): New function to test if the image is based on a color palette. Above functions are written by Troy Patteson and submitted via SourceForge patch #54 "Wand API patches: has colormap, is gray image, is monochrome image, is opaque image, is palette image".
> - fuzzing: Added initial OSS-Fuzz integration by Alex Gaynor. From SourceForge patch #55 "OSS-Fuzz integration"
> - coders/png.c (ReadMNGImage): Fix free using possibly unallocated pointer value.
> - magick/blob.c (SeekBlob): Remove implicit extension of blob allocation size based on seek offset. Besides making an assumption about how the blob memory was allocated, this reallocation feature provides a memory DOS opportunity. Resolves issue reported by Alex Gaynor via email entitled "Security issue with memory management in Magick++" to the graphicsmagick-security list on 31 Jan 2018. (SeekBlob):
> - coders/jpeg.c (ReadIPTCProfile): Revert inadvertent wrong return codes added by change on December 9, 2017. Fixes SourceForge bug 542 "Improper call to JPEG library in state 201" since 1.3.28.

2018-02-01 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/annotate.c (RenderFreetype): Fixed the text opacity computation in RenderFreeType(). This bug caused the text fill color to bleed into the character cell when the SVG "fill-opacity" is less than 1.0.

2018-02-01 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - magick/attribute.c (CloneImageAttributes): Fixed a bug in which the source image attributes would always replace the destination image attributes instead of being appended to them, and the destination image attributes would become a memory leak.

2018-01-31 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement): Fixed a bug in which the x,y location values for a <text> or <tspan> were overwritten by the x,y values for the next <tspan> before the previous values were used. This caused the text associated with the previous <text> or <tspan> to appear at the location specified for the next <tspan>.

2018-01-30 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/static.c: Use !defined(SupportMagickModules) to enable static module loader. Fixes SourceForge bug #543 "Multiple definition of "OpenModule" (etc) when cross-compiling shared".

2018-01-29 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement): A terminating '>' in a geometry string is interpreted to mean that the dimensions of an image should only be changed if its width or height exceeds the geometry specification. For an unapparent and undocumented reason, a terminating '>', if present, was being nulled out, making this feature unusable for SVG files (now fixed).

2018-01-29 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (ReadSVGImage): If there is a geometry string in image_info->size (e.g., gm convert -size "50x50%" in.svg out.png), AllocateImage() sets image->columns and image->rows to the width and height values from the size string. However, this makes no sense if the size string was something like "50x50%" (we'll get columns = rows = 50). So we set columns and rows to 0 after AllocateImage(), which is the same as if no size string was supplied by the client. This also results in svg_info.bounds to be set to 0,0 (i.e., unknown), so that svg_info.bounds will later be set using the image size information from either the svg "canvas" width/height or from the viewbox. Later, variable "page" is set from svg_info->bounds. Then the geometry string in image_info->size gets applied to the (now known) "page" width and height when SvgStartElement() calls GetMagickGeometry(), and the intended result is obtained.

2018-01-24 Greg Wolfe <gregory.wolfe@kodakalaris.com>

> - coders/svg.c (SVGStartElement): When the density (DPI) is specified using the ImageInfo::density member, the derived scale factor is incorrectly applied a second time to the width and height members of variable RectangleInfo page. Fixes SourceForge ticket #451.

2018-01-23 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/static.c: Use a lazy-loader for static modules with the same external interface as the lazy-loader for dynamic modules.

2018-01-20 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - NEWS.txt: Prepare for 1.3.28 release.

2018-01-17 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - NEWS.txt: Update with changes since previous release.

2018-01-14 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - PerlMagick/Magick.xs: Compiler warnings reduction.
> - magick/pixel_cache.h: Mark GetPixels(), GetIndexes(), and GetOnePixel() as deprecated. Compilers may produce a warning if these functions are used.
> - magick/pixel_cache.c (InterpolateColor): Return black pixel if InterpolateViewColor() reports failure.
> - coders/png.c (ReadMNGImage): Fix memory leak of chunk and mng_info in error path.
> - coders/gif.c (ReadGIFImage): Fix memory leak of global colormap.

2018-01-13 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/symbols.h: Fix SourceForge issue #538 "13 symbols in common with ImageMagick despite --enable-symbol-prefix".
> - coders/bmp.c (ReadBMPImage): Fix non-terminal loop due to unexpected bit-field mask value. Fixes SourceForge issue #541 "Infinite Loop in ReadBMPImage (coders/bmp.c)".
> - coders/jpeg.c (JPEGMessageHandler): Revert code added on 2017-07-08 to promote certain warnings from libjpeg to errors. Add code to rationalize claimed image dimensions based on file size. Resolves SourceForge issue #539 "Images with libjpeg warnings result in error".

2018-01-11 Fojtik Jaroslav <JaFojtik@seznam.cz>

> - coders/wpg.c Recursive ReadImage could return multiple scenes
>     fixed.

2018-01-07 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - coders/png.c (ReadOnePNGImage): Quit 'passes' loop if we encountered an error
> - magick/pixel_cache.c (SetNexus): Fix heap overwrite in AcquireCacheNexus() due to SetNexus() not using an allocated staging area for the pixels like it should. This problem impacts all 1.3.X releases. Resolves SourceForge issues 532 "heap-buffer-overflow bug in ReadWPGImage" and #531 "heap-buffer-overflow in AcquireCacheNexus".
> - magick/pixel_cache.c (InterpolateViewColor): Now returns MagickPassFail rather than void. Code using this function is updated to check the return status.

2018-01-01 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/describe.c (DescribeImage): Discriminate between AcquireImagePixels() returning NULL or finding a transparent pixel. This avoids use of a null pointer in the case where AcquireImagePixels() returns NULL.

2017-12-31 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - magick/static.c: Change static module initialization to be based on an initialized list rather than a squence of function calls in order to simplify maintenance and possibly address future requirements.

2017-12-30 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>

> - Copyright.txt: Bump copyright years and rotate ChangeLog.

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