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avformat/mov: Use av_mul_q() to avoid integer overflows 

Fixes: signed integer overflow: 538976288 * 538976288 cannot be represented in type 'int'
Fixes: 27473/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5758978289827840

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-22 19:13:01 +01:00
parent 4dfb7ff528
commit 4f70e1ec0c
1 changed files with 2 additions and 4 deletions
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6
libavformat/mov.c
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@ -2354,12 +2354,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
if (tmcd_ctx->tmcd_flags & 0x0008) {
int timescale = AV_RB32(st->codecpar->extradata + 8);
int framedur = AV_RB32(st->codecpar->extradata + 12);
st->avg_frame_rate.num *= timescale;
st->avg_frame_rate.den *= framedur;
st->avg_frame_rate = av_mul_q(st->avg_frame_rate, (AVRational){timescale, framedur});
#if FF_API_LAVF_AVCTX
FF_DISABLE_DEPRECATION_WARNINGS
st->codec->time_base.den *= timescale;
st->codec->time_base.num *= framedur;
st->codec->time_base = av_mul_q(st->codec->time_base , (AVRational){framedur, timescale});
FF_ENABLE_DEPRECATION_WARNINGS
#endif
}