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avcodec/vmdvideo: Check len before using it in method 3

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Fixes out of array access
Fixes: asan_heap-oob_4d23ba_91_cov_3853393937_128.vmd

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 3030fb7e0d)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-16 16:24:55 +01:00
parent a4ffcf024e
commit 195e8ecacc
1 changed files with 3 additions and 0 deletions
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3
libavcodec/vmdvideo.c
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@ -339,6 +339,9 @@ static int vmd_decode(VmdVideoContext *s, AVFrame *frame)
ofs += slen;
bytestream2_skip(&gb, len);
} else {
if (ofs + len > frame_width ||
bytestream2_get_bytes_left(&gb) < len)
return AVERROR_INVALIDDATA;
bytestream2_get_buffer(&gb, &dp[ofs], len);
ofs += len;
}