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avcodec/snowdec: Check qbias

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Fixes: signed integer overflow: -1094995529 * 131 cannot be represented in type 'int'
Fixes: 1353/clusterfuzz-testcase-minimized-5208180449607680

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-06 01:08:54 +02:00
parent 859cc5c8e6
commit 523205ce1e
1 changed files with 5 additions and 0 deletions
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5
libavcodec/snowdec.c
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@ -395,6 +395,11 @@ static int decode_header(SnowContext *s){
s->block_max_depth= 0;
return AVERROR_INVALIDDATA;
}
if (FFABS(s->qbias) > 127) {
av_log(s->avctx, AV_LOG_ERROR, "qbias %d is too large\n", s->qbias);
s->qbias = 0;
return AVERROR_INVALIDDATA;
}
return 0;
}