tiff: Security fix CVE-2016-3186

CVE-2016-3186 libtiff: 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

Patch from:
https://bugzilla.redhat.com/attachment.cgi?id=1144235&action=diff

(From OE-Core rev: 3d818fc862b1d85252443fefa2222262542a10ae)

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-multimedia/libtiff/files/CVE-2016-3186.patch

@@ -0,0 +1,24 @@
+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));

meta/recipes-multimedia/libtiff/tiff_4.0.6.bb

@@ -8,6 +8,7 @@ SRC_URI = "ftp://ftp.remotesensing.org/pub/libtiff/tiff-${PV}.tar.gz \
            file://CVE-2015-8665_8683.patch \
            file://CVE-2015-8781.patch \
            file://CVE-2015-8784.patch \
+           file://CVE-2016-3186.patch \
           "
 
 SRC_URI[md5sum] = "d1d2e940dea0b5ad435f21f03d96dd72"