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Fix some buffer overflows:
http://seclists.org/oss-sec/2016/q4/408
http://bugzilla.maptools.org/show_bug.cgi?id=2592
2016-11-11 Even Rouault <even.rouault at spatialys.com>
* tools/tiffcrop.c: fix multiple uint32 overflows in
writeBufferToSeparateStrips(), writeBufferToContigTiles() and
writeBufferToSeparateTiles() that could cause heap buffer
overflows.
Reported by Henri Salo from Nixu Corporation.
Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2592
/cvs/maptools/cvsroot/libtiff/ChangeLog,v <-- ChangeLog
new revision: 1.1152; previous revision: 1.1151
/cvs/maptools/cvsroot/libtiff/tools/tiffcrop.c,v <-- tools/tiffcrop.c
new revision: 1.43; previous revision: 1.42
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/tools/tiffcrop.c,v
retrieving revision 1.42
retrieving revision 1.43
diff -u -r1.42 -r1.43
--- libtiff/tools/tiffcrop.c 14 Oct 2016 19:13:20 -0000 1.42
+++ libtiff/tools/tiffcrop.c 11 Nov 2016 19:33:06 -0000 1.43
@@ -148,6 +148,8 @@
#define PATH_MAX 1024
#endif
+#define TIFF_UINT32_MAX 0xFFFFFFFFU
+
#ifndef streq
#define streq(a,b) (strcmp((a),(b)) == 0)
#endif
@@ -1164,7 +1166,24 @@
(void) TIFFGetFieldDefaulted(out, TIFFTAG_ROWSPERSTRIP, &rowsperstrip);
(void) TIFFGetField(out, TIFFTAG_BITSPERSAMPLE, &bps);
bytes_per_sample = (bps + 7) / 8;
- rowsize = ((bps * spp * width) + 7) / 8; /* source has interleaved samples */
+ if( width == 0 ||
+ (uint32)bps * (uint32)spp > TIFF_UINT32_MAX / width ||
+ bps * spp * width > TIFF_UINT32_MAX - 7U )
+ {
+ TIFFError(TIFFFileName(out),
+ "Error, uint32 overflow when computing (bps * spp * width) + 7");
+ return 1;
+ }
+ rowsize = ((bps * spp * width) + 7U) / 8; /* source has interleaved samples */
+ if( bytes_per_sample == 0 ||
+ rowsperstrip > TIFF_UINT32_MAX / bytes_per_sample ||
+ rowsperstrip * bytes_per_sample > TIFF_UINT32_MAX / (width + 1) )
+ {
+ TIFFError(TIFFFileName(out),
+ "Error, uint32 overflow when computing rowsperstrip * "
+ "bytes_per_sample * (width + 1)");
+ return 1;
+ }
rowstripsize = rowsperstrip * bytes_per_sample * (width + 1);
obuf = _TIFFmalloc (rowstripsize);
@@ -1251,11 +1270,19 @@
}
}
+ if( imagewidth == 0 ||
+ (uint32)bps * (uint32)spp > TIFF_UINT32_MAX / imagewidth ||
+ bps * spp * imagewidth > TIFF_UINT32_MAX - 7U )
+ {
+ TIFFError(TIFFFileName(out),
+ "Error, uint32 overflow when computing (imagewidth * bps * spp) + 7");
+ return 1;
+ }
+ src_rowsize = ((imagewidth * spp * bps) + 7U) / 8;
+
tilebuf = _TIFFmalloc(tile_buffsize);
if (tilebuf == 0)
return 1;
-
- src_rowsize = ((imagewidth * spp * bps) + 7) / 8;
for (row = 0; row < imagelength; row += tl)
{
nrow = (row + tl > imagelength) ? imagelength - row : tl;
@@ -1315,7 +1342,16 @@
TIFFGetField(out, TIFFTAG_TILELENGTH, &tl);
TIFFGetField(out, TIFFTAG_TILEWIDTH, &tw);
TIFFGetField(out, TIFFTAG_BITSPERSAMPLE, &bps);
- src_rowsize = ((imagewidth * spp * bps) + 7) / 8;
+
+ if( imagewidth == 0 ||
+ (uint32)bps * (uint32)spp > TIFF_UINT32_MAX / imagewidth ||
+ bps * spp * imagewidth > TIFF_UINT32_MAX - 7 )
+ {
+ TIFFError(TIFFFileName(out),
+ "Error, uint32 overflow when computing (imagewidth * bps * spp) + 7");
+ return 1;
+ }
+ src_rowsize = ((imagewidth * spp * bps) + 7U) / 8;
for (row = 0; row < imagelength; row += tl)
{
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