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avformat/mov: Check STCO location

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Fixes: bypassing of checks and assertion failure
Fixes: asan_1003879.mp4

Found-by: Clusterfuzz + asan
Reported-by: Thomas Guilbert <tguilbert@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 1cd41840208bce7e690a4ccc48077567418a0aa8)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-01-11 12:09:08 +01:00
parent 862c0048ec
commit e1146c8b72
1 changed files with 4 additions and 0 deletions
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4
libavformat/mov.c
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@ -1980,6 +1980,10 @@ static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
MOVStreamContext *sc;
unsigned int i, entries;
if (c->trak_index < 0) {
av_log(c->fc, AV_LOG_WARNING, "STCO outside TRAK\n");
return 0;
}
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];