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avidec: check for valid bit_rate range

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If bit_rate is negative, it can trigger an av_assert2 in av_rescale_rnd.

Since av_rescale returns int64_t, but st->codec_bit_rate is int, it can
also overflow into a negative value.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Andreas Cadhalpun 2015-05-04 21:07:52 +02:00 committed by Michael Niedermayer
parent 783e94cb11
commit 0eec40b713
1 changed files with 5 additions and 1 deletions
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6
libavformat/avidec.c
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@ -451,6 +451,7 @@ static int calculate_bitrate(AVFormatContext *s)
int64_t len = 0;
AVStream *st = s->streams[i];
int64_t duration;
int64_t bitrate;
for (j = 0; j < st->nb_index_entries; j++)
len += st->index_entries[j].size;
@ -458,7 +459,10 @@ static int calculate_bitrate(AVFormatContext *s)
if (st->nb_index_entries < 2 || st->codec->bit_rate > 0)
continue;
duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
st->codec->bit_rate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
if (bitrate <= INT_MAX && bitrate > 0) {
st->codec->bit_rate = bitrate;
}
}
return 1;
}