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avformat/utils: reorder duration computation to avoid overflow 

Fixes: signed integer overflow: 8 * 9223372036854774783 cannot be represented in type 'long'
Fixes: 23381/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4818340509122560

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 10cc82c35b)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-06-21 12:24:04 +02:00
parent 3ea2cfe162
commit 6fe28832a9
1 changed files with 1 additions and 1 deletions
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libavformat/utils.c
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@ -2783,7 +2783,7 @@ static void estimate_timings_from_bit_rate(AVFormatContext *ic)
st = ic->streams[i];
if ( st->time_base.num <= INT64_MAX / ic->bit_rate
&& st->duration == AV_NOPTS_VALUE) {
duration = av_rescale(8 * filesize, st->time_base.den,
duration = av_rescale(filesize, 8LL * st->time_base.den,
ic->bit_rate *
(int64_t) st->time_base.num);
st->duration = duration;