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Fix CVE-2016-9273:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9273
http://bugzilla.maptools.org/show_bug.cgi?id=2587
Patch extracted from upstream CVS repo:
2016-11-10 Even Rouault <even.rouault at spatialys.com>
revision 1.37
date: 2016-11-09 18:00:49 -0500; author: erouault; state: Exp; lines: +10 -1; commitid: pzKipPxDJO2dxvtz;
* libtiff/tif_strip.c: make TIFFNumberOfStrips() return the td->td_nstrips
value when it is non-zero, instead of recomputing it. This is needed in
TIFF_STRIPCHOP mode where td_nstrips is modified. Fixes a read outsize of
array in tiffsplit (or other utilities using TIFFNumberOfStrips()).
Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2587
Index: libtiff/tif_strip.c
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_strip.c,v
retrieving revision 1.36
retrieving revision 1.37
diff -u -r1.36 -r1.37
--- a/libtiff/tif_strip.c 7 Jun 2015 22:35:40 -0000 1.36
+++ b/libtiff/tif_strip.c 9 Nov 2016 23:00:49 -0000 1.37
@@ -63,6 +63,15 @@
TIFFDirectory *td = &tif->tif_dir;
uint32 nstrips;
+ /* If the value was already computed and store in td_nstrips, then return it,
+ since ChopUpSingleUncompressedStrip might have altered and resized the
+ since the td_stripbytecount and td_stripoffset arrays to the new value
+ after the initial affectation of td_nstrips = TIFFNumberOfStrips() in
+ tif_dirread.c ~line 3612.
+ See http://bugzilla.maptools.org/show_bug.cgi?id=2587 */
+ if( td->td_nstrips )
+ return td->td_nstrips;
+
nstrips = (td->td_rowsperstrip == (uint32) -1 ? 1 :
TIFFhowmany_32(td->td_imagelength, td->td_rowsperstrip));
if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
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