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avcodec/vp7: check buffer size

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Fixes overread
Fixes Ticket 3501
Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-03-29 04:25:50 +01:00
parent 067ada04d1
commit 46f72ea507
1 changed files with 5 additions and 0 deletions
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5
libavcodec/vp8.c
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@ -434,6 +434,11 @@ static int vp7_decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_si
s->invisible = 0;
part1_size = AV_RL24(buf) >> 4;
if (buf_size < 4 - s->profile + part1_size) {
av_log(s->avctx, AV_LOG_ERROR, "Buffer size %d is too small, needed : %d\n", buf_size, 4 - s->profile + part1_size);
return AVERROR_INVALIDDATA;
}
buf += 4 - s->profile;
buf_size -= 4 - s->profile;