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avcodec/fmvc: Check nb_blocks

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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>
This commit is contained in:
Michael Niedermayer 2017-05-13 01:22:27 +02:00
parent e664882523
commit 0158b405a7
1 changed files with 3 additions and 0 deletions
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3
libavcodec/fmvc.c
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@ -561,6 +561,9 @@ static av_cold int decode_init(AVCodecContext *avctx)
} }
s->nb_blocks = s->xb * s->yb; s->nb_blocks = s->xb * s->yb;
if (!s->nb_blocks)
return AVERROR_INVALIDDATA;
s->blocks = av_calloc(s->nb_blocks, sizeof(*s->blocks)); s->blocks = av_calloc(s->nb_blocks, sizeof(*s->blocks));
if (!s->blocks) if (!s->blocks)
return AVERROR(ENOMEM); return AVERROR(ENOMEM);