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avformat/mov: disallow a zero sample size in trun atoms 

In order to not generate 0 sized packets or create a huge index table
needlessly.

Fixes: Timeout
Fixes: 43717/clusterfuzz-testcase-minimized-ffmpeg_IO_DEMUXER_fuzzer-5206008287330304
Fixes: 45738/clusterfuzz-testcase-minimized-ffmpeg_IO_DEMUXER_fuzzer-6142535657979904

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2022-06-27 21:52:35 +02:00
parent 7acc124121
commit 03d81a044a
1 changed files with 2 additions and 0 deletions
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2
libavformat/mov.c
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@ -5179,6 +5179,8 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
distance++;
if (av_sat_add64(dts, sample_duration) != dts + (uint64_t)sample_duration)
return AVERROR_INVALIDDATA;
if (!sample_size)
return AVERROR_INVALIDDATA;
dts += sample_duration;
offset += sample_size;
sc->data_size += sample_size;