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Fix heap buffer overflow in tiffcp when parsing number of inks:
http://bugzilla.maptools.org/show_bug.cgi?id=2599
2016-12-03 Even Rouault <even.rouault at spatialys.com>
* 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
/cvs/maptools/cvsroot/libtiff/ChangeLog,v <-- ChangeLog
new revision: 1.1184; previous revision: 1.1183
/cvs/maptools/cvsroot/libtiff/libtiff/tif_dir.c,v <-- libtiff/tif_dir.c
new revision: 1.128; previous revision: 1.127
Index: libtiff/libtiff/tif_dir.c
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_dir.c,v
retrieving revision 1.127
retrieving revision 1.128
diff -u -r1.127 -r1.128
--- libtiff/libtiff/tif_dir.c 25 Oct 2016 21:35:15 -0000 1.127
+++ libtiff/libtiff/tif_dir.c 3 Dec 2016 15:30:31 -0000 1.128
@@ -1,4 +1,4 @@
-/* $Id: tif_dir.c,v 1.127 2016-10-25 21:35:15 erouault Exp $ */
+/* $Id: tif_dir.c,v 1.128 2016-12-03 15:30:31 erouault Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@@ -854,6 +854,32 @@
if( fip == NULL ) /* cannot happen since TIFFGetField() already checks it */
return 0;
+ if( tag == TIFFTAG_NUMBEROFINKS )
+ {
+ int i;
+ for (i = 0; i < td->td_customValueCount; i++) {
+ uint16 val;
+ TIFFTagValue *tv = td->td_customValues + i;
+ if (tv->info->field_tag != tag)
+ continue;
+ val = *(uint16 *)tv->value;
+ /* Truncate to SamplesPerPixel, since the */
+ /* setting code for INKNAMES assume that there are SamplesPerPixel */
+ /* inknames. */
+ /* Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2599 */
+ if( val > td->td_samplesperpixel )
+ {
+ TIFFWarningExt(tif->tif_clientdata,"_TIFFVGetField",
+ "Truncating NumberOfInks from %u to %u",
+ val, td->td_samplesperpixel);
+ val = td->td_samplesperpixel;
+ }
+ *va_arg(ap, uint16*) = val;
+ return 1;
+ }
+ return 0;
+ }
+
/*
* We want to force the custom code to be used for custom
* fields even if the tag happens to match a well known
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