[FFmpeg-cvslog] avformat/oggparsevorbis: check packet size before reading new_len from it

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sun Mar  2 05:02:15 2014 +0100| [f5d1d1e4667ba346ea7e0f97e6d2756bc9d4abde] | committer: Michael Niedermayer

avformat/oggparsevorbis: check packet size before reading new_len from it

Fixes out of array read
Fixes: 34260c7981118fb38fba61809bf4dd5a-asan_heap-oob_93b923_1508_cov_951051643_DivX640x480_oggvorbis.avi
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f5d1d1e4667ba346ea7e0f97e6d2756bc9d4abde
---

 libavformat/oggparsevorbis.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/oggparsevorbis.c b/libavformat/oggparsevorbis.c
index 2739123..3f0797b 100644
--- a/libavformat/oggparsevorbis.c
+++ b/libavformat/oggparsevorbis.c
@@ -347,7 +347,7 @@ static int vorbis_header(AVFormatContext *s, int idx)
             avpriv_set_pts_info(st, 64, 1, srate);
         }
     } else if (os->buf[os->pstart] == 3) {
-        if (vorbis_update_metadata(s, idx) >= 0) {
+        if (vorbis_update_metadata(s, idx) >= 0 && priv->len[1] > 10) {
             // drop all metadata we parsed and which is not required by libvorbis
             unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
             if (new_len >= 16 && new_len < os->psize) {