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estimate_timings_from_bit_rate: Check timebase and bitrate

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Fixes integer overflow and assertion failure

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-03-28 01:43:55 +01:00
parent 1831274ff1
commit ea9a6709a9
1 changed files with 4 additions and 2 deletions
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6
libavformat/utils.c
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@ -2325,9 +2325,11 @@ static void estimate_timings_from_bit_rate(AVFormatContext *ic)
if (filesize > 0) {
for(i = 0; i < ic->nb_streams; i++) {
st = ic->streams[i];
duration= av_rescale(8*filesize, st->time_base.den, ic->bit_rate*(int64_t)st->time_base.num);
if (st->duration == AV_NOPTS_VALUE)
if ( st->time_base.num <= INT64_MAX / ic->bit_rate
&& st->duration == AV_NOPTS_VALUE) {
duration= av_rescale(8*filesize, st->time_base.den, ic->bit_rate*(int64_t)st->time_base.num);
st->duration = duration;
}
}
}
}