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avcodec/snowdec: Check width

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Fixes: out of array read
Fixes: 1419/clusterfuzz-testcase-minimized-6108700873850880

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 78aa93807b)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-09 16:08:14 +02:00
parent 8198258d9e
commit 2790054dc2
1 changed files with 4 additions and 0 deletions
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4
libavcodec/snowdec.c
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@ -384,6 +384,10 @@ static int decode_header(SnowContext *s){
av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count);
return AVERROR_INVALIDDATA;
}
if (s->avctx->width > 65536-4) {
av_log(s->avctx, AV_LOG_ERROR, "Width %d is too large\n", s->avctx->width);
return AVERROR_INVALIDDATA;
}
s->qlog += get_symbol(&s->c, s->header_state, 1);