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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@gmx.at>
(cherry picked from commit c3d7f00ee3)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-10-04 04:29:40 +02:00
parent e0ed766f2a
commit 27d82d8374
1 changed files with 1 additions and 1 deletions
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2
libavformat/mpegts.c
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@ -1632,7 +1632,7 @@ 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",