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avformat/mov: Limit nb_chapter_tracks to input size

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Fixes: Timeout (15k loop iterations instead of 400m)
Fixes: 31368/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6601583174483968

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 299a56c900)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-04-19 13:30:17 +02:00
parent 29052446dc
commit 75b816f2c4
1 changed files with 2 additions and 0 deletions
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2
libavformat/mov.c
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@ -4097,6 +4097,8 @@ static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)
for (i = 0; i < num && !pb->eof_reached; i++)
c->chapter_tracks[i] = avio_rb32(pb);
c->nb_chapter_tracks = i;
return 0;
}