[OE-core] [PATCH 13/16] gst-ffmpeg: Security Advisory - ffmpeg - CVE-2011-3941

[rongqing.li at windriver.com]

From: Yue Tao <Yue.Tao at windriver.com>

The decode_mb function in libavcodec/error_resilience.c in FFmpeg before
0.10 allows remote attackers to have an unspecified impact via vectors
related to an uninitialized block index, which triggers an out-of-bound
write.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-3941

Signed-off-by: Yue Tao <Yue.Tao at windriver.com>
Signed-off-by: Roy Li <rongqing.li at windriver.com>
---
 ...-error-concealment-initialize-block-index.patch |   29 ++++++++++++++++++++
 .../gstreamer/gst-ffmpeg_0.10.13.bb                |    1 +
 2 files changed, 30 insertions(+)
 create mode 100644 meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-error-concealment-initialize-block-index.patch

diff --git a/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-error-concealment-initialize-block-index.patch b/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-error-concealment-initialize-block-index.patch
new file mode 100644
index 0000000..e0e4239
--- /dev/null
+++ b/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-error-concealment-initialize-block-index.patch
@@ -0,0 +1,29 @@
+gst-ffmpeg: error concealment: initialize block index.
+
+Fixes CVE-2011-3941 (out of bounds write)
+
+Upstream-Status: Backport 
+
+Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
+Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
+---
+ libavcodec/error_resilience.c |    3 +++
+ 1 files changed, 3 insertions(+), 0 deletions(-)
+
+diff --git a/libavcodec/error_resilience.c b/libavcodec/error_resilience.c
+index 8bb5d0c..d55c000 100644
+--- a/gst-libs/ext/libav/libavcodec/error_resilience.c
++++ b/gst-libs/ext/libav/libavcodec/error_resilience.c
+@@ -45,6 +45,9 @@ static void decode_mb(MpegEncContext *s, int ref){
+     s->dest[1] = s->current_picture.data[1] + (s->mb_y * (16>>s->chroma_y_shift) * s->uvlinesize) + s->mb_x * (16>>s->chroma_x_shift);
+     s->dest[2] = s->current_picture.data[2] + (s->mb_y * (16>>s->chroma_y_shift) * s->uvlinesize) + s->mb_x * (16>>s->chroma_x_shift);
+ 
++    ff_init_block_index(s);
++    ff_update_block_index(s);
++
+     if(CONFIG_H264_DECODER && s->codec_id == CODEC_ID_H264){
+         H264Context *h= (void*)s;
+         h->mb_xy= s->mb_x + s->mb_y*s->mb_stride;
+-- 
+1.7.5.4
+
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 c3681b6..dd07435 100644
--- a/meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb
+++ b/meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb
@@ -49,6 +49,7 @@ SRC_URI = "http://gstreamer.freedesktop.org/src/${BPN}/${BPN}-${PV}.tar.bz2 \
            file://0001-huffyuvdec-check-width-more-completely-avoid-out-of-.patch \
            file://0001-smackerdec-Check-that-the-last-indexes-are-within-th.patch \
            file://0001-avcodec-dsputil-fix-signedness-in-sizeof-comparissio.patch \
+           file://0001-error-concealment-initialize-block-index.patch \
 "
 
 SRC_URI[md5sum] = "7f5beacaf1312db2db30a026b36888c4"
-- 
1.7.10.4