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avformat/mov: Check element count in mov_metadata_hmmt()

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Fixes: Timeout
Fixes: 30325/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6048395703746560

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 1d277b92fa4c149d589e6828d4e18ad578406f1f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-02-15 20:41:31 +01:00
parent 7fd5a96f7f
commit 947ce7cca0
1 changed files with 2 additions and 0 deletions
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2
libavformat/mov.c
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@ -288,6 +288,8 @@ static int mov_metadata_hmmt(MOVContext *c, AVIOContext *pb, unsigned len)
return 0;
n_hmmt = avio_rb32(pb);
if (n_hmmt > len / 4)
return AVERROR_INVALIDDATA;
for (i = 0; i < n_hmmt && !pb->eof_reached; i++) {
int moment_time = avio_rb32(pb);
avpriv_new_chapter(c->fc, i, av_make_q(1, 1000), moment_time, AV_NOPTS_VALUE, NULL);