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avformat/swfenc: Fix integer overflow in frame rate handling

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Fixes: signed integer overflow: 30000299 * 256 cannot be represented in type 'int'
Fixes: ticket8184

Found-by: Suhwan
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-02-16 18:32:31 +01:00
parent a629cec58e
commit 31f956acad
1 changed files with 1 additions and 1 deletions
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libavformat/swfenc.c
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@ -256,7 +256,7 @@ static int swf_write_header(AVFormatContext *s)
av_log(s, AV_LOG_ERROR, "Invalid (too large) frame rate %d/%d\n", rate, rate_base);
return AVERROR(EINVAL);
}
avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
avio_wl16(pb, (rate * 256LL) / rate_base); /* frame rate */
swf->duration_pos = avio_tell(pb);
avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */