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mov: Make sure the read sample count is nonnegative

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This avoids setting a negative number of frames, ending up with a
negative average frame rate.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2013-09-28 23:57:36 +03:00
parent 640a2427aa
commit c231987662
1 changed files with 4 additions and 0 deletions
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4
libavformat/mov.c
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@ -1724,6 +1724,10 @@ static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
sample_count=avio_rb32(pb);
sample_duration = avio_rb32(pb);
if (sample_count < 0) {
av_log(c->fc, AV_LOG_ERROR, "Invalid sample_count=%d\n", sample_count);
return AVERROR_INVALIDDATA;
}
sc->stts_data[i].count= sample_count;
sc->stts_data[i].duration= sample_duration;