gst-ffmpeg: fix for Security Advisory CVE-2013-0850

The decode_slice_header function in libavcodec/h264.c in FFmpeg before
1.1 allows remote attackers to have an unspecified impact via crafted
H.264 data, which triggers an out-of-bounds array access.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-0850

(From OE-Core rev: 69f3f0f94f4fd224e5a6b275207adf0539d085c3)

(From OE-Core rev: bf7b08d94c1d8282ca7ea584254d5c0d1fd7e469)

Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 30 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-h264-correct-ref-count-check-and-limit-fix-out-of-ar.patch b/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-h264-correct-ref-count-check-and-limit-fix-out-of-ar.patch
new file mode 100644
index 0000000000..d4f55b2696
--- /dev/null
+++ b/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-h264-correct-ref-count-check-and-limit-fix-out-of-ar.patch
@@ -0,0 +1,29 @@
+From d6c184880ee2e09fd68c0ae217173832cee5afc1 Mon Sep 17 00:00:00 2001
+From: Michael Niedermayer <michaelni@gmx.at>
+Date: Sun, 18 Nov 2012 16:29:04 +0100
+Subject: [PATCH] h264: correct ref count check and limit, fix out of array
+ accesses.
+
+Upstream-Status: Backport
+
+Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
+Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
+---
+ libavcodec/h264.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libavcodec/h264.c b/libavcodec/h264.c
+index da43f1e..32cede5 100644
+--- a/gst-libs/ext/libav/libavcodec/h264.c
++++ b/gst-libs/ext/libav/libavcodec/h264.c
+@@ -2870,6 +2870,9 @@ static int decode_slice_header(H264Conte
+             h->ref_count[0]= get_ue_golomb(&s->gb) + 1;
+             if(h->slice_type_nos==AV_PICTURE_TYPE_B)
+                 h->ref_count[1]= get_ue_golomb(&s->gb) + 1;
++            else
++                // full range is spec-ok in this case, even for frames
++                h->ref_count[1] = 1;
+ 
+             if(h->ref_count[0]-1 > 32-1 || h->ref_count[1]-1 > 32-1){
+                 av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow\n");
+-- 
diff --git a/meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb b/meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb
index a0673fd668..ad85fa2e9f 100644
--- a/meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb
+++ b/meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb
@@ -34,6 +34,7 @@ SRC_URI = "http://gstreamer.freedesktop.org/src/${BPN}/${BPN}-${PV}.tar.bz2 \
            file://0001-eamad-fix-out-of-array-accesses.patch \
            file://0001-mjpegdec-check-SE.patch \
            file://0001-alac-fix-nb_samples-order-case.patch \
+           file://0001-h264-correct-ref-count-check-and-limit-fix-out-of-ar.patch \
 "
 
 SRC_URI[md5sum] = "7f5beacaf1312db2db30a026b36888c4"