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* tools/tiffcrop.c: Fix out-of-bounds write in loadImage().

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From patch libtiff-CVE-2016-3991.patch from
libtiff-4.0.3-25.el7_2.src.rpm by Nikola Forro (bugzilla #2543)
This commit is contained in:
Even Rouault 2016-08-15 21:05:40 +00:00
parent a71b62bcff
commit 5dd73c2b77
2 changed files with 63 additions and 4 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2016-08-15 Even Rouault <even.rouault at spatialys.com>
* tools/tiffcrop.c: Fix out-of-bounds write in loadImage().
From patch libtiff-CVE-2016-3991.patch from
libtiff-4.0.3-25.el7_2.src.rpm by Nikola Forro (bugzilla #2543)
2016-08-15 Even Rouault <even.rouault at spatialys.com>
* libtiff/tif_pixarlog.c: Fix write buffer overflow in PixarLogEncode

59
tools/tiffcrop.c
View File

@ -1,4 +1,4 @@
/* $Id: tiffcrop.c,v 1.37 2016-07-11 21:38:31 erouault Exp $ */
/* $Id: tiffcrop.c,v 1.38 2016-08-15 21:05:40 erouault Exp $ */
/* tiffcrop.c -- a port of tiffcp.c extended to include manipulations of
* the image data through additional options listed below
@ -798,6 +798,11 @@ static int readContigTilesIntoBuffer (TIFF* in, uint8* buf,
}
tile_buffsize = tilesize;
if (tilesize == 0 || tile_rowsize == 0)
{
TIFFError("readContigTilesIntoBuffer", "Tile size or tile rowsize is zero");
exit(-1);
}
if (tilesize < (tsize_t)(tl * tile_rowsize))
{
@ -807,6 +812,11 @@ static int readContigTilesIntoBuffer (TIFF* in, uint8* buf,
tilesize, tl * tile_rowsize);
#endif
tile_buffsize = tl * tile_rowsize;
if (tl != (tile_buffsize / tile_rowsize))
{
TIFFError("readContigTilesIntoBuffer", "Integer overflow when calculating buffer size.");
exit(-1);
}
}
tilebuf = _TIFFmalloc(tile_buffsize);
@ -1210,6 +1220,12 @@ static int writeBufferToContigTiles (TIFF* out, uint8* buf, uint32 imagelength,
!TIFFGetField(out, TIFFTAG_BITSPERSAMPLE, &bps) )
return 1;
if (tilesize == 0 || tile_rowsize == 0 || tl == 0 || tw == 0)
{
TIFFError("writeBufferToContigTiles", "Tile size, tile row size, tile width, or tile length is zero");
exit(-1);
}
tile_buffsize = tilesize;
if (tilesize < (tsize_t)(tl * tile_rowsize))
{
@ -1219,6 +1235,11 @@ static int writeBufferToContigTiles (TIFF* out, uint8* buf, uint32 imagelength,
tilesize, tl * tile_rowsize);
#endif
tile_buffsize = tl * tile_rowsize;
if (tl != tile_buffsize / tile_rowsize)
{
TIFFError("writeBufferToContigTiles", "Integer overflow when calculating buffer size");
exit(-1);
}
}
tilebuf = _TIFFmalloc(tile_buffsize);
@ -5945,12 +5966,27 @@ loadImage(TIFF* in, struct image_data *image, struct dump_opts *dump, unsigned c
TIFFGetField(in, TIFFTAG_TILELENGTH, &tl);
tile_rowsize = TIFFTileRowSize(in);
if (ntiles == 0 || tlsize == 0 || tile_rowsize == 0)
{
TIFFError("loadImage", "File appears to be tiled, but the number of tiles, tile size, or tile rowsize is zero.");
exit(-1);
}
buffsize = tlsize * ntiles;
if (tlsize != (buffsize / ntiles))
{
TIFFError("loadImage", "Integer overflow when calculating buffer size");
exit(-1);
}
if (buffsize < (uint32)(ntiles * tl * tile_rowsize))
{
buffsize = ntiles * tl * tile_rowsize;
if (ntiles != (buffsize / tl / tile_rowsize))
{
TIFFError("loadImage", "Integer overflow when calculating buffer size");
exit(-1);
}
#ifdef DEBUG2
TIFFError("loadImage",
"Tilesize %u is too small, using ntiles * tilelength * tilerowsize %lu",
@ -5969,8 +6005,25 @@ loadImage(TIFF* in, struct image_data *image, struct dump_opts *dump, unsigned c
TIFFGetFieldDefaulted(in, TIFFTAG_ROWSPERSTRIP, &rowsperstrip);
stsize = TIFFStripSize(in);
nstrips = TIFFNumberOfStrips(in);
buffsize = stsize * nstrips;
if (nstrips == 0 || stsize == 0)
{
TIFFError("loadImage", "File appears to be striped, but the number of stipes or stripe size is zero.");
exit(-1);
}
buffsize = stsize * nstrips;
if (stsize != (buffsize / nstrips))
{
TIFFError("loadImage", "Integer overflow when calculating buffer size");
exit(-1);
}
uint32 buffsize_check;
buffsize_check = ((length * width * spp * bps) + 7);
if (length != ((buffsize_check - 7) / width / spp / bps))
{
TIFFError("loadImage", "Integer overflow detected.");
exit(-1);
}
if (buffsize < (uint32) (((length * width * spp * bps) + 7) / 8))
{
buffsize = ((length * width * spp * bps) + 7) / 8;