[OE-core] [PATCH 02/16] gst-ffmpeg: Security Advisory - ffmpeg - CVE-2013-0875

[rongqing.li at windriver.com]

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

The ff_add_png_paeth_prediction function in libavcodec/pngdec.c in
FFmpeg before 1.1.3 allows remote attackers to have an unspecified
impact via a crafted PNG image, related to an out-of-bounds array
access.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-0875

Signed-off-by: Yue Tao <Yue.Tao at windriver.com>
Signed-off-by: Roy Li <rongqing.li at windriver.com>
---
 ...er-dont-access-out-of-array-elements-at-t.patch |   44 ++++++++++++++++++++
 .../gstreamer/gst-ffmpeg_0.10.13.bb                |    1 +
 2 files changed, 45 insertions(+)
 create mode 100644 meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-pngdec-filter-dont-access-out-of-array-elements-at-t.patch

diff --git a/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-pngdec-filter-dont-access-out-of-array-elements-at-t.patch b/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-pngdec-filter-dont-access-out-of-array-elements-at-t.patch
new file mode 100644
index 0000000..1e5fb7d
--- /dev/null
+++ b/meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/0001-pngdec-filter-dont-access-out-of-array-elements-at-t.patch
@@ -0,0 +1,44 @@
+gst-ffmpeg: pngdec/filter: dont access out of array elements at the end
+
+Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
+
+Upstream-Status: Backport 
+
+Signed-off-by: Yue Tao <yue.tao at windriver.com>
+---
+ libavcodec/pngdec.c |   12 ++++--------
+ 1 files changed, 4 insertions(+), 8 deletions(-)
+
+diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
+index 97c0ad1..193e35e 100644
+--- a/gst-libs/ext/libav/libavcodec/pngdec.c
++++ b/gst-libs/ext/libav/libavcodec/pngdec.c
+@@ -190,7 +190,7 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w
+     if(bpp >= 2) g = dst[1];\
+     if(bpp >= 3) b = dst[2];\
+     if(bpp >= 4) a = dst[3];\
+-    for(; i < size; i+=bpp) {\
++    for(; i <= size - bpp; i+=bpp) {\
+         dst[i+0] = r = op(r, src[i+0], last[i+0]);\
+         if(bpp == 1) continue;\
+         dst[i+1] = g = op(g, src[i+1], last[i+1]);\
+@@ -206,13 +206,9 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w
+     else if(bpp == 2) UNROLL1(2, op)\
+     else if(bpp == 3) UNROLL1(3, op)\
+     else if(bpp == 4) UNROLL1(4, op)\
+-    else {\
+-        for (; i < size; i += bpp) {\
+-            int j;\
+-            for (j = 0; j < bpp; j++)\
+-                dst[i+j] = op(dst[i+j-bpp], src[i+j], last[i+j]);\
+-        }\
+-    }
++    for (; i < size; i++) {\
++        dst[i] = op(dst[i-bpp], src[i], last[i]);\
++    }\
+ 
+ /* NOTE: 'dst' can be equal to 'last' */
+ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
+-- 
+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 b4fc8c7..98f8103 100644
--- a/meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb
+++ b/meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb
@@ -37,6 +37,7 @@ SRC_URI = "http://gstreamer.freedesktop.org/src/${BPN}/${BPN}-${PV}.tar.bz2 \
            file://0001-h264-correct-ref-count-check-and-limit-fix-out-of-ar.patch \
            file://0001-roqvideodec-check-dimensions-validity.patch \
            file://0001-aacdec-check-channel-count.patch \
+           file://0001-pngdec-filter-dont-access-out-of-array-elements-at-t.patch \
 "
 
 SRC_URI[md5sum] = "7f5beacaf1312db2db30a026b36888c4"
-- 
1.7.10.4