[FFmpeg-cvslog] avformat/mpegts: Check desc_len / get8() return code

[Michael Niedermayer]

ffmpeg | branch: release/1.2 | Michael Niedermayer <michaelni at gmx.at> | Sat Oct  4 04:29:40 2014 +0200| [c4f0f3c52d977b58dc7723fbcb97ee8b1b0f588d] | committer: Michael Niedermayer

avformat/mpegts: Check desc_len / get8() return code

Fixes out of array read
Fixes: signal_sigsegv_844d59_10_signal_sigsegv_a17bb7_366_mpegts_mpeg2video_mp2_dvbsub_topfield.rec

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit c3d7f00ee3e09801f56f25db8b5961f25e842bd2)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c4f0f3c52d977b58dc7723fbcb97ee8b1b0f588d
---

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

diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index c2efb53..58633d8 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -1695,7 +1695,7 @@ static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
                 break;
             desc_len = get8(&p, desc_list_end);
             desc_end = p + desc_len;
-            if (desc_end > desc_list_end)
+            if (desc_len < 0 || desc_end > desc_list_end)
                 break;
 
             av_dlog(ts->stream, "tag: 0x%02x len=%d\n",