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avcodec/fmvc: Check nb_blocks
Fixes: out of array read Fixes: 1508/clusterfuzz-testcase-minimized-5011336327069696 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 0158b405a71f386c7844a3d975315afd47f16b5d) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -561,6 +561,9 @@ static av_cold int decode_init(AVCodecContext *avctx)
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}
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s->nb_blocks = s->xb * s->yb;
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if (!s->nb_blocks)
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return AVERROR_INVALIDDATA;
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s->blocks = av_calloc(s->nb_blocks, sizeof(*s->blocks));
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if (!s->blocks)
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return AVERROR(ENOMEM);
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