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Fix CVE-2016-5314.
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-5314
bugzilla.maptools.org/show_bug.cgi?id=2554
Patch extracted from upstream CVS repo with:
$ cvs diff -u -r1.43 -r1.44 libtiff/tif_pixarlog.c
Index: libtiff/tif_pixarlog.c
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_pixarlog.c,v
retrieving revision 1.43
retrieving revision 1.44
diff -u -r1.43 -r1.44
--- libtiff/libtiff/tif_pixarlog.c 27 Dec 2015 20:14:11 -0000 1.43
+++ libtiff/libtiff/tif_pixarlog.c 28 Jun 2016 15:12:19 -0000 1.44
@@ -459,6 +459,7 @@
typedef struct {
TIFFPredictorState predict;
z_stream stream;
+ tmsize_t tbuf_size; /* only set/used on reading for now */
uint16 *tbuf;
uint16 stride;
int state;
@@ -694,6 +695,7 @@
sp->tbuf = (uint16 *) _TIFFmalloc(tbuf_size);
if (sp->tbuf == NULL)
return (0);
+ sp->tbuf_size = tbuf_size;
if (sp->user_datafmt == PIXARLOGDATAFMT_UNKNOWN)
sp->user_datafmt = PixarLogGuessDataFmt(td);
if (sp->user_datafmt == PIXARLOGDATAFMT_UNKNOWN) {
@@ -783,6 +785,12 @@
TIFFErrorExt(tif->tif_clientdata, module, "ZLib cannot deal with buffers this size");
return (0);
}
+ /* Check that we will not fill more than what was allocated */
+ if (sp->stream.avail_out > sp->tbuf_size)
+ {
+ TIFFErrorExt(tif->tif_clientdata, module, "sp->stream.avail_out > sp->tbuf_size");
+ return (0);
+ }
do {
int state = inflate(&sp->stream, Z_PARTIAL_FLUSH);
if (state == Z_STREAM_END) {
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