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avformat/oggparsetheora: Check duration to be not AV_NOPTS_VALUE (and positive) before use 

Fixes: 1536b9b096a8f95b742bae9d3d761cc6/signal_sigsegv_294aaed_7322_4fad88a38dc8952dc20dcb60c1895758.ogg

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-12-04 13:46:53 +01:00
parent 2ff61c3c1a
commit 0c1d62ab9d
1 changed files with 1 additions and 1 deletions
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2
libavformat/oggparsetheora.c
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@ -191,7 +191,7 @@ static int theora_packet(AVFormatContext *s, int idx)
os->lastpts = os->lastdts = theora_gptopts(s, idx, os->granule, NULL) - duration;
if(s->streams[idx]->start_time == AV_NOPTS_VALUE) {
s->streams[idx]->start_time = os->lastpts;
if (s->streams[idx]->duration)
if (s->streams[idx]->duration > 0)
s->streams[idx]->duration -= s->streams[idx]->start_time;
}
}