gst-ffmpeg: fix for Security Advisory CVE-2013-0856

The lpc_prediction function in libavcodec/alac.c in FFmpeg before 1.1
allows remote attackers to have an unspecified impact via crafted Apple
Lossless Audio Codec (ALAC) data, related to a large nb_samples value.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-0856

(From OE-Core rev: 571ccce77859435ff8010785e11627b20d8b31f4)

(From OE-Core rev: a51eb5fc4c5c2da67219bdd0d84c6fab8ed2343e)

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, 31 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-alac-fix-nb_samples-order-case.patch b/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-alac-fix-nb_samples-order-case.patch
new file mode 100644
index 0000000000..10ce0f332c
--- /dev/null
+++ b/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-alac-fix-nb_samples-order-case.patch
@@ -0,0 +1,30 @@
+From e0884eadf6a15e93142131b695f48776f9a0ac31 Mon Sep 17 00:00:00 2001
+From: Michael Niedermayer <michaelni@gmx.at>
+Date: Sat, 10 Nov 2012 17:14:04 +0100
+Subject: [PATCH] alac: fix nb_samples < order case
+
+Upstream-Status: Backport
+
+Commit e0884eadf6a15e93142131b695f48776f9a0ac31 release/1.0
+
+Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
+Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
+(cherry picked from commit fd4f4923cce6a2cbf4f48640b4ac706e614a1594)
+---
+ libavcodec/alac.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libavcodec/alac.c b/libavcodec/alac.c
+index 9cd1737..e8e844a 100644
+--- a/gst-libs/ext/libav/libavcodec/alac.c
++++ b/gst-libs/ext/libav/libavcodec/alac.c
+@@ -278,7 +278,7 @@ static void predictor_decompress_fir_ada
+ 
+     /* read warm-up samples */
+     if (predictor_coef_num > 0)
+-        for (i = 0; i < predictor_coef_num; i++) {
++        for (i = 0; i < predictor_coef_num && i < output_size; i++) {
+             int32_t val;
+ 
+             val = buffer_out[i] + error_buffer[i+1];
+-- 
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 28ea29e41b..a0673fd668 100644
--- a/meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb
+++ b/meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb
@@ -33,6 +33,7 @@ SRC_URI = "http://gstreamer.freedesktop.org/src/${BPN}/${BPN}-${PV}.tar.bz2 \
            file://0001-atrac3dec-Check-coding-mode-against-channels.patch \
            file://0001-eamad-fix-out-of-array-accesses.patch \
            file://0001-mjpegdec-check-SE.patch \
+           file://0001-alac-fix-nb_samples-order-case.patch \
 "
 
 SRC_URI[md5sum] = "7f5beacaf1312db2db30a026b36888c4"