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avformat/dxa: Use av_rescale() for duration computation 

Fixes: signed integer overflow: 8224000000 * 1629552639 cannot be represented in type 'long'
Fixes: 24908/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4658478506049536

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 c313089fbe)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-09-02 23:13:00 +02:00
parent 49eb5761b6
commit 5973df8f6a
1 changed files with 1 additions and 1 deletions
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libavformat/dxa.c
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@ -143,7 +143,7 @@ static int dxa_read_header(AVFormatContext *s)
c->readvid = !c->has_sound;
c->vidpos = avio_tell(pb);
s->start_time = 0;
s->duration = (int64_t)c->frames * AV_TIME_BASE * num / den;
s->duration = av_rescale(c->frames, AV_TIME_BASE * (int64_t)num, den);
av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);
return 0;