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2015-12-27 Even Rouault <even.rouault at spatialys.com>
* libtiff/tif_next.c: fix potential out-of-bound write in NeXTDecode()
triggered by http://lcamtuf.coredump.cx/afl/vulns/libtiff5.tif
(bugzilla #2508)
diff -u -r1.16 -r1.18
--- libtiff/libtiff/tif_next.c 29 Dec 2014 12:09:11 -0000 1.16
+++ libtiff/libtiff/tif_next.c 27 Dec 2015 17:14:52 -0000 1.18
@@ -1,4 +1,4 @@
-/* $Id: tif_next.c,v 1.16 2014-12-29 12:09:11 erouault Exp $ */
+/* $Id: tif_next.c,v 1.18 2015-12-27 17:14:52 erouault Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@@ -37,7 +37,7 @@
case 0: op[0] = (unsigned char) ((v) << 6); break; \
case 1: op[0] |= (v) << 4; break; \
case 2: op[0] |= (v) << 2; break; \
- case 3: *op++ |= (v); break; \
+ case 3: *op++ |= (v); op_offset++; break; \
} \
}
@@ -103,6 +103,7 @@
}
default: {
uint32 npixels = 0, grey;
+ tmsize_t op_offset = 0;
uint32 imagewidth = tif->tif_dir.td_imagewidth;
if( isTiled(tif) )
imagewidth = tif->tif_dir.td_tilewidth;
@@ -122,10 +123,15 @@
* bounds, potentially resulting in a security
* issue.
*/
- while (n-- > 0 && npixels < imagewidth)
+ while (n-- > 0 && npixels < imagewidth && op_offset < scanline)
SETPIXEL(op, grey);
if (npixels >= imagewidth)
break;
+ if (op_offset >= scanline ) {
+ TIFFErrorExt(tif->tif_clientdata, module, "Invalid data for scanline %ld",
+ (long) tif->tif_row);
+ return (0);
+ }
if (cc == 0)
goto bad;
n = *bp++, cc--;
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