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lavf: avoid integer overflow when estimating bitrate 

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2013-08-24 21:30:46 +02:00
parent fab694dd39
commit df33a58e53
1 changed files with 7 additions and 2 deletions
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9
libavformat/utils.c
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@ -1757,8 +1757,13 @@ static void estimate_timings_from_bit_rate(AVFormatContext *ic)
int bit_rate = 0;
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
if (st->codec->bit_rate > 0)
bit_rate += st->codec->bit_rate;
if (st->codec->bit_rate > 0) {
if (INT_MAX - st->codec->bit_rate > bit_rate) {
bit_rate = 0;
break;
}
bit_rate += st->codec->bit_rate;
}
}
ic->bit_rate = bit_rate;
}