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avcodec/mpeg12dec: Fixes runtime error: division by zero

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Fixes: 1464/clusterfuzz-testcase-minimized-4925445571084288

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c0ece1f4addf8ac31df95775a2d36be2a55fc759)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-11 00:49:31 +02:00
parent ee12581551
commit 3cb8d1f2c1
1 changed files with 2 additions and 1 deletions
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libavcodec/mpeg12dec.c
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@ -1291,7 +1291,8 @@ static int mpeg_decode_postinit(AVCodecContext *avctx)
if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
// MPEG-1 aspect
avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
} else { // MPEG-2
// MPEG-2 aspect
if (s->aspect_ratio_info > 1) {