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avcodec/zmbv: Check that the buffer is large enough for mvec

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Fixes: Timeout
Fixes: 4143/clusterfuzz-testcase-4736864637419520

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 2ab9568a2c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-11-15 17:11:12 +01:00
parent bc65abecd3
commit b9b4d34ecf
1 changed files with 2 additions and 0 deletions
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2
libavcodec/zmbv.c
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@ -539,6 +539,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPac
} else {
frame->key_frame = 0;
frame->pict_type = AV_PICTURE_TYPE_P;
if (c->decomp_len < 2LL * ((c->width + c->bw - 1) / c->bw) * ((c->height + c->bh - 1) / c->bh))
return AVERROR_INVALIDDATA;
if (c->decomp_len)
c->decode_xor(c);
}