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	Changes in TIFF v4.0.8
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TIFF CHANGE INFORMATION
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<UL>
<HR SIZE=4 WIDTH=65% ALIGN=left>
Current Version: v4.0.8 
Previous Version: <A HREF=v4.0.7.html>v4.0.7</a> 
Master FTP Site: <A HREF="ftp://download.osgeo.org/libtiff">
download.osgeo.org</a>, directory pub/libtiff</A> 
Master HTTP Site #1: <A HREF="http://www.simplesystems.org/libtiff/">
http://www.simplesystems.org/libtiff/</a> 
Master HTTP Site #2: <A HREF="http://libtiff.maptools.org/">
http://libtiff.maptools.org/</a> 
<HR SIZE=4 WIDTH=65% ALIGN=left>
</UL>

This document describes the changes made to the software between the
previous and current versions (see above). If you don't
find something listed here, then it was not done in this timeframe, or
it was not considered important enough to be mentioned. The following
information is located here:
<UL>
<LI><A HREF="#highlights">Major Changes</A>
<LI><A HREF="#configure">Changes in the software configuration</A>
<LI><A HREF="#libtiff">Changes in libtiff</A>
<LI><A HREF="#tools">Changes in the tools</A>
<LI><A HREF="#contrib">Changes in the contrib area</A>
</UL>
 
<HR WIDTH=65% ALIGN=left>

<A NAME="highlights">MAJOR CHANGES:</A>

<UL>

<LI> None

</UL>

<A NAME="configure">CHANGES IN THE SOFTWARE CONFIGURATION:</A>

<UL>

<LI> None

</UL>

<A NAME="libtiff">CHANGES IN LIBTIFF:</A>

<UL>

<LI> libtiff/tif_getimage.c, libtiff/tif_open.c: add parenthesis
 to fix cppcheck clarifyCalculation warnings *
 libtiff/tif_predict.c, libtiff/tif_print.c: fix printf
 unsigned vs signed formatting (cppcheck
 invalidPrintfArgType_uint warnings)

<LI> libtiff/tif_read.c, libtiff/tiffiop.h: fix uint32 overflow in
 TIFFReadEncodedStrip() that caused an integer division by
 zero. Reported by Agostino Sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2596

<LI> libtiff/tif_pixarlog.c, libtiff/tif_luv.c: fix heap-based
 buffer overflow on generation of PixarLog / LUV compressed
 files, with ColorMap, TransferFunction attached and nasty
 plays with bitspersample. The fix for LUV has not been
 tested, but suffers from the same kind of issue of PixarLog.
 Reported by Agostino Sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2604

<LI> libtiff/tif_strip.c: revert the change in
 TIFFNumberOfStrips() done for
 http://bugzilla.maptools.org/show_bug.cgi?id=2587 /
 CVE-2016-9273 since the above change is a better fix that
 makes it unnecessary.

<LI> libtiff/tif_dirread.c: modify ChopUpSingleUncompressedStrip()
 to instanciate compute ntrips as
 TIFFhowmany_32(td->td_imagelength, rowsperstrip), instead of a
 logic based on the total size of data. Which is faulty is the
 total size of data is not sufficient to fill the whole image,
 and thus results in reading outside of the
 StripByCounts/StripOffsets arrays when using
 TIFFReadScanline(). Reported by Agostino Sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2608.

<LI> libtiff/tif_ojpeg.c: make OJPEGDecode() early exit in case of
 failure in OJPEGPreDecode(). This will avoid a divide by zero,
 and potential other issues. Reported by Agostino Sarubbo.
 Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2611

<LI> libtiff/tif_write.c: fix misleading indentation as warned by GCC.

<LI> libtiff/tif_fax3.h: revert change done on 2016-01-09 that
 made Param member of TIFFFaxTabEnt structure a uint16 to
 reduce size of the binary. It happens that the Hylafax
 software uses the tables that follow this typedef
 (TIFFFaxMainTable, TIFFFaxWhiteTable, TIFFFaxBlackTable),
 although they are not in a public libtiff header. Raised by
 Lee Howard. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2636

<LI> libtiff/tiffio.h, libtiff/tif_getimage.c: add
 TIFFReadRGBAStripExt() and TIFFReadRGBATileExt() variants of
 the functions without ext, with an extra argument to control
 the stop_on_error behaviour.

<LI> libtiff/tif_getimage.c: fix potential memory leaks in error
 code path of TIFFRGBAImageBegin(). Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2627

<LI> libtiff/tif_jpeg.c: increase libjpeg max memory usable to 10
 MB instead of libjpeg 1MB default. This helps when creating
 files with "big" tile, without using libjpeg temporary files.
 Related to https://trac.osgeo.org/gdal/ticket/6757

<LI> libtiff/tif_jpeg.c: avoid integer division by zero in
 JPEGSetupEncode() when horizontal or vertical sampling is set
 to 0. Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2653

<LI> libtiff/tif_dirwrite.c: in
 TIFFWriteDirectoryTagCheckedRational, replace assertion by
 runtime check to error out if passed value is strictly
 negative. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2535

<LI> libtiff/tif_dirread.c: avoid division by floating point 0 in
 TIFFReadDirEntryCheckedRational() and
 TIFFReadDirEntryCheckedSrational(), and return 0 in that case
 (instead of infinity as before presumably) Apparently some
 sanitizers do not like those divisions by zero. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2644

<LI> libtiff/tif_dir.c, tif_dirread.c, tif_dirwrite.c: implement
 various clampings of double to other data types to avoid
 undefined behaviour if the output range isn't big enough to
 hold the input value. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2643
 http://bugzilla.maptools.org/show_bug.cgi?id=2642
 http://bugzilla.maptools.org/show_bug.cgi?id=2646
 http://bugzilla.maptools.org/show_bug.cgi?id=2647

<LI> libtiff/tif_jpeg.c: validate BitsPerSample in
 JPEGSetupEncode() to avoid undefined behaviour caused by
 invalid shift exponent. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2648

<LI> libtiff/tif_read.c: avoid potential undefined behaviour on
 signed integer addition in TIFFReadRawStrip1() in isMapped()
 case. Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2650

<LI> libtiff/tif_getimage.c: add explicit uint32 cast in
 putagreytile to avoid UndefinedBehaviorSanitizer warning.
 Patch by Nicolás Peña. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2658

<LI> libtiff/tif_read.c: TIFFReadBufferSetup(): use _TIFFcalloc()
 to zero initialize tif_rawdata. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2651

<LI> libtiff/tiffio.h, tif_unix.c, tif_win32.c, tif_vms.c: add
 _TIFFcalloc()

<LI> libtiff/tif_luv.c, tif_lzw.c, tif_packbits.c: return 0 in
 Encode functions instead of -1 when TIFFFlushData1() fails.
 Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2130

<LI> libtiff/tif_ojpeg.c: fix leak in
 OJPEGReadHeaderInfoSecTablesQTable,
 OJPEGReadHeaderInfoSecTablesDcTable and
 OJPEGReadHeaderInfoSecTablesAcTable when read fails. Patch by
 Nicolás Peña. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2659

<LI> libtiff/tif_jpeg.c: only run JPEGFixupTagsSubsampling() if
 the YCbCrSubsampling tag is not explicitly present. This helps
 a bit to reduce the I/O amount when the tag is present
 (especially on cloud hosted files).

<LI> libtiff/tif_lzw.c: in LZWPostEncode(), increase, if
 necessary, the code bit-width after flushing the remaining
 code and before emitting the EOI code. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=1982

<LI> libtiff/tif_pixarlog.c: fix memory leak in error code path of
 PixarLogSetupDecode(). Patch by Nicolás Peña. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2665

<LI> libtiff/tif_fax3.c, tif_predict.c, tif_getimage.c: fix GCC 7
 -Wimplicit-fallthrough warnings.

<LI> libtiff/tif_dirread.c: fix memory leak in non
 DEFER_STRILE_LOAD mode (ie default) when there is both a
 StripOffsets and TileOffsets tag, or a StripByteCounts and
 TileByteCounts Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2689

<LI> libtiff/tif_ojpeg.c: fix potential memory leak in
 OJPEGReadHeaderInfoSecTablesQTable,
 OJPEGReadHeaderInfoSecTablesDcTable and
 OJPEGReadHeaderInfoSecTablesAcTable Patch by Nicolás Peña.
 Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2670

<LI> libtiff/tif_fax3.c: avoid crash in Fax3Close() on empty file.
 Patch by Alan Coopersmith + complement by myself. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2673

<LI> libtiff/tif_read.c: TIFFFillStrip(): add limitation to the
 number of bytes read in case td_stripbytecount[strip] is
 bigger than reasonable, so as to avoid excessive memory
 allocation.

<LI> libtiff/tif_zip.c, tif_pixarlog.c, tif_predict.c: fix memory
 leak when the underlying codec (ZIP, PixarLog) succeeds its
 setupdecode() method, but PredictorSetup fails. Credit to
 OSS-Fuzz (locally run, on GDAL)

<LI> libtiff/tif_read.c: TIFFFillStrip() and TIFFFillTile(): avoid
 excessive memory allocation in case of shorten files. Only
 effective on 64 bit builds and non-mapped cases. Credit to
 OSS-Fuzz (locally run, on GDAL)

<LI> libtiff/tif_read.c: TIFFFillStripPartial() / TIFFSeek(),
 avoid potential integer overflows with read_ahead in
 CHUNKY_STRIP_READ_SUPPORT mode. Should
 especially occur on 32 bit platforms.

<LI> libtiff/tif_read.c: TIFFFillStripPartial(): avoid excessive
 memory allocation in case of shorten files. Only effective on
 64 bit builds. Credit to OSS-Fuzz (locally run, on GDAL)

<LI> libtiff/tif_read.c: update tif_rawcc in
 CHUNKY_STRIP_READ_SUPPORT mode with tif_rawdataloaded when
 calling TIFFStartStrip() or TIFFFillStripPartial(). This
 avoids reading beyond tif_rawdata when bytecount >
 tif_rawdatasize. Fixes
 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1545.
 Credit to OSS-Fuzz

<LI> libtiff/tif_color.c: avoid potential int32 overflow in
 TIFFYCbCrToRGBInit() Fixes
 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1533
 Credit to OSS-Fuzz

<LI> libtiff/tif_pixarlog.c, tif_luv.c: avoid potential int32
 overflows in multiply_ms() and add_ms(). Fixes
 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1558
 Credit to OSS-Fuzz

<LI> libtiff/tif_packbits.c: fix out-of-buffer read in
 PackBitsDecode() Fixes
 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1563
 Credit to OSS-Fuzz

<LI> libtiff/tif_luv.c: LogL16InitState(): avoid excessive memory
 allocation when RowsPerStrip tag is missing.
 Credit to OSS-Fuzz (locally run, on GDAL)

<LI> libtiff/tif_lzw.c: update dec_bitsleft at beginning of
 LZWDecode(), and update tif_rawcc at end of LZWDecode(). This
 is needed to properly work with the latest chnges in
 tif_read.c in CHUNKY_STRIP_READ_SUPPORT mode.

<LI> libtiff/tif_pixarlog.c: PixarLogDecode(): resync tif_rawcp
 with next_in and tif_rawcc with avail_in at beginning and end
 of function, similarly to what is done in LZWDecode(). Likely
 needed so that it works properly with latest chnges in
 tif_read.c in CHUNKY_STRIP_READ_SUPPORT mode. But untested...

<LI> libtiff/tif_getimage.c: initYCbCrConversion(): add basic
 validation of luma and refBlackWhite coefficients (just check
 they are not NaN for now), to avoid potential float to int
 overflows. Fixes
 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1663
 Credit to OSS Fuzz

<LI> libtiff/tif_read.c: _TIFFVSetField(): fix outside range cast
 of double to float. Credit to Google Autofuzz project

<LI> libtiff/tif_getimage.c: initYCbCrConversion(): check luma[1]
 is not zero to avoid division by zero. Fixes
 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1665
 Credit to OSS Fuzz

<LI> libtiff/tif_read.c: _TIFFVSetField(): fix outside range cast
 of double to float. Credit to Google Autofuzz project

<LI> libtiff/tif_getimage.c: initYCbCrConversion(): stricter
 validation for refBlackWhite coefficients values. To avoid
 invalid float->int32 conversion. Fixes
 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1718
 Credit to OSS Fuzz

</UL>

<A NAME="tools">CHANGES IN THE TOOLS:</A>

<UL>

<LI> tools/fax2tiff.c (main): Applied patch by Jörg Ahrens to fix
 passing client data for Win32 builds using tif_win32.c
 (USE_WIN32_FILEIO defined) for file I/O. Patch was provided
 via email on November 20, 2016.

<LI> tools/tiffcp.c: avoid uint32 underflow in cpDecodedStrips
 that can cause various issues, such as buffer overflows in the
 library. Reported by Agostino Sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2598

<LI> tools/tiffcrop.c: fix readContigStripsIntoBuffer() in -i
 (ignore) mode so that the output buffer is correctly
 incremented to avoid write outside bounds. Reported by
 Agostino Sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2620

<LI> tools/tiffcrop.c: add 3 extra bytes at end of strip buffer in
 readSeparateStripsIntoBuffer() to avoid read outside of heap
 allocated buffer. Reported by Agostino Sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2621

<LI> tools/tiffcrop.c: fix integer division by zero when
 BitsPerSample is missing. Reported by Agostino Sarubbo.
 Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2619

<LI> tools/tiffinfo.c: fix null pointer dereference in -r mode
 when the image has no StripByteCount tag. Reported by
 Agostino Sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2594

<LI> tools/tiffcp.c: avoid potential division by zero is
 BitsPerSamples tag is missing. Reported by Agostino Sarubbo.
 Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2597

<LI> tools/tif_dir.c: when TIFFGetField(, TIFFTAG_NUMBEROFINKS, )
 is called, limit the return number of inks to SamplesPerPixel,
 so that code that parses ink names doesn't go past the end of
 the buffer. Reported by Agostino Sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2599

<LI> tools/tiffcp.c: avoid potential division by zero is
 BitsPerSamples tag is missing. Reported by Agostino Sarubbo.
 Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2607

<LI> tools/tiffcp.c: fix uint32 underflow/overflow that can cause
 heap-based buffer overflow. Reported by Agostino Sarubbo.
 Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2610

<LI> tools/tiffcp.c: replace assert( (bps % 8) == 0 ) by a non
 assert check. Reported by Agostino Sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2605

<LI> tools/tiff2ps.c: fix 2 heap-based buffer overflows (in
 PSDataBW and PSDataColorContig). Reported by Agostino Sarubbo.
 Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2633 and
 http://bugzilla.maptools.org/show_bug.cgi?id=2634.

<LI> tools/tiff2pdf.c: prevent heap-based buffer overflow in -j
 mode on a paletted image. Note: this fix errors out before the
 overflow happens. There could probably be a better fix. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2635

<LI> tools/tiff2pdf.c: fix wrong usage of memcpy() that can
 trigger unspecified behaviour. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2638

<LI> tools/tiff2pdf.c: avoid potential invalid memory read in
 t2p_writeproc. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2639

<LI> tools/tiff2pdf.c: avoid potential heap-based overflow in
 t2p_readwrite_pdf_image_tile(). Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2640

<LI> tools/tiffcrop.c: remove extraneous TIFFClose() in error code
 path, that caused double free. Related to
 http://bugzilla.maptools.org/show_bug.cgi?id=2535

<LI> tools/tiffcp.c: error out cleanly in cpContig2SeparateByRow
 and cpSeparate2ContigByRow if BitsPerSample != 8 to avoid heap
 based overflow. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2656 and
 http://bugzilla.maptools.org/show_bug.cgi?id=2657

<LI> tools/raw2tiff.c: avoid integer division by zero. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2631

<LI> tools/tiff2ps.c: call TIFFClose() in error code paths.

<LI> tools/fax2tiff.c: emit appropriate message if the input file
 is empty. Patch by Alan Coopersmith. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2672

<LI> tools/tiff2bw.c: close TIFF handle in error code path. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2677

</UL>

<A NAME="contrib">CHANGES IN THE CONTRIB AREA:</A>

<UL>

<LI> None

</UL>

Last updated $Date: 2017-05-21 17:47:46 $.

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