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avcodec/midivid: Check vector index

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Fixes: out of array read
Fixes: 20494/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MVDV_fuzzer-5681452423577600

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-02-09 14:53:15 +01:00
parent ac5d5046c8
commit b0eec1391e
1 changed files with 2 additions and 0 deletions
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2
libavcodec/midivid.c
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@ -126,6 +126,8 @@ static int decode_mvdv(MidiVidContext *s, AVCodecContext *avctx, AVFrame *frame)
idx9bits--;
idx = bytestream2_get_byte(gb) | (((idx9val >> (7 - idx9bits)) & 1) << 8);
}
if (idx >= nb_vectors)
return AVERROR_INVALIDDATA;
dsty[x +frame->linesize[0]] = vec[idx * 12 + 0];
dsty[x+1+frame->linesize[0]] = vec[idx * 12 + 3];