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Buffer overflow in the readextension function in gif2tiff.c
allows remote attackers to cause a denial of service via a crafted GIF file.
External References:
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-3186
https://bugzilla.redhat.com/show_bug.cgi?id=1319503
CVE: CVE-2016-3186
Upstream-Status: Backport (RedHat)
https://bugzilla.redhat.com/attachment.cgi?id=1144235&action=diff
Signed-off-by: Yi Zhao <yi.zhao@windirver.com>
--- tiff-4.0.6/tools/gif2tiff.c 2016-04-06 15:43:01.586048341 +0200
+++ tiff-4.0.6/tools/gif2tiff.c 2016-04-06 15:48:05.523207710 +0200
@@ -349,7 +349,7 @@
int status = 1;
(void) getc(infile);
- while ((count = getc(infile)) && count <= 255)
+ while ((count = getc(infile)) && count >= 0 && count <= 255)
if (fread(buf, 1, count, infile) != (size_t) count) {
fprintf(stderr, "short read from file %s (%s)\n",
filename, strerror(errno));
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