gst-ffmpeg: fix for Security Advisory CVE-2013-0852

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

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-0852

(From OE-Core rev: 37f9371b44bd914fdd64e4c4e4448a2908512203)

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>

meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-pgssubdec-check-RLE-size-before-copying.-Fix-out-of-.patch

@@ -0,0 +1,34 @@
+From 28bf685bfc6d0c744369cdf367f61a78d80d0b01 Mon Sep 17 00:00:00 2001
+From: Michael Niedermayer <michaelni@gmx.at>
+Date: Thu, 15 Nov 2012 16:41:28 +0100
+Subject: [PATCH] pgssubdec: check RLE size before copying. Fix out of array
+ accesses
+
+Upstream-Status: Backport
+
+Commit 28bf685bfc6d0c744369cdf367f61a78d80d0b01 release/1.1
+
+Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
+Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
+(cherry picked from commit c0d68be555f5858703383040e04fcd6529777061)
+---
+ libavcodec/pgssubdec.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/libavcodec/pgssubdec.c b/libavcodec/pgssubdec.c
+index 728f178..26a3c2a 100644
+--- a/gst-libs/ext/libav/libavcodec/pgssubdec.c
++++ b/gst-libs/ext/libav/libavcodec/pgssubdec.c
+@@ -202,6 +202,11 @@ static int parse_picture_segment(AVCodec
+         return -1;
+     }
+ 
++    if (buf_size > rle_bitmap_len) {
++        av_log(avctx, AV_LOG_ERROR, "too much RLE data\n");
++        return AVERROR_INVALIDDATA;
++    }
++
+     ctx->picture.w = width;
+     ctx->picture.h = height;
+ 
+-- 

meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb

@@ -29,6 +29,7 @@ SRC_URI = "http://gstreamer.freedesktop.org/src/${BPN}/${BPN}-${PV}.tar.bz2 \
            file://0001-huffyuvdec-Skip-len-0-cases.patch \
            file://0001-huffyuvdec-Check-init_vlc-return-codes.patch \
            file://0001-alsdec-check-block-length.patch \
+           file://0001-pgssubdec-check-RLE-size-before-copying.-Fix-out-of-.patch \
 "
 
 SRC_URI[md5sum] = "7f5beacaf1312db2db30a026b36888c4"