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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<TITLE>
Changes in TIFF v4.0.8
</TITLE>
</HEAD>
<BODY BGCOLOR=white>
<FONT FACE="Helvetica, Arial, Sans">
<BASEFONT SIZE=4>
<B><FONT SIZE=+3>T</FONT>IFF <FONT SIZE=+2>C</FONT>HANGE <FONT SIZE=+2>I</FONT>NFORMATION</B>
<BASEFONT SIZE=3>
<UL>
<HR SIZE=4 WIDTH=65% ALIGN=left>
<B>Current Version</B>: v4.0.8<BR>
<B>Previous Version</B>: <A HREF=v4.0.7.html>v4.0.7</a><BR>
<B>Master Download Site</B>: <A HREF="https://download.osgeo.org/libtiff">
download.osgeo.org</a>, directory pub/libtiff</A><BR>
<B>Master HTTP Site #1</B>: <A HREF="http://www.simplesystems.org/libtiff/">
http://www.simplesystems.org/libtiff/</a><BR>
<B>Master HTTP Site #2</B>: <A HREF="http://libtiff.maptools.org/">
http://libtiff.maptools.org/</a>
<HR SIZE=4 WIDTH=65% ALIGN=left>
</UL>
<P>
This document describes the changes made to the software between the
<I>previous</I> and <I>current</I> 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>
<p>
<P><HR WIDTH=65% ALIGN=left>
<!--------------------------------------------------------------------------->
<A NAME="highlights"><B><FONT SIZE=+3>M</FONT>AJOR CHANGES:</B></A>
<UL>
<LI> None
</UL>
<P><HR WIDTH=65% ALIGN=left>
<!--------------------------------------------------------------------------->
<A NAME="configure"><B><FONT SIZE=+3>C</FONT>HANGES IN THE SOFTWARE CONFIGURATION:</B></A>
<UL>
<LI> None
</UL>
<P><HR WIDTH=65% ALIGN=left>
<!--------------------------------------------------------------------------->
<A NAME="libtiff"><B><FONT SIZE=+3>C</FONT>HANGES IN LIBTIFF:</B></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 instantiate 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(): 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_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>
<P><HR WIDTH=65% ALIGN=left>
<!-------------------------------------------------------------------------->
<A NAME="tools"><B><FONT SIZE=+3>C</FONT>HANGES IN THE TOOLS:</B></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>
<P><HR WIDTH=65% ALIGN=left>
<!--------------------------------------------------------------------------->
<A NAME="contrib"><B><FONT SIZE=+3>C</FONT>HANGES IN THE CONTRIB AREA:</B></A>
<UL>
<LI> None
</UL>
Last updated $Date: 2017-05-21 17:47:46 $.
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