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avcodec/vp7: check buffer size
Fixes overread Fixes Ticket 3501 Found-by: Piotr Bandurski <ami_stuff@o2.pl> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -434,6 +434,11 @@ static int vp7_decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_si
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s->invisible = 0;
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s->invisible = 0;
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part1_size = AV_RL24(buf) >> 4;
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part1_size = AV_RL24(buf) >> 4;
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if (buf_size < 4 - s->profile + part1_size) {
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av_log(s->avctx, AV_LOG_ERROR, "Buffer size %d is too small, needed : %d\n", buf_size, 4 - s->profile + part1_size);
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return AVERROR_INVALIDDATA;
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}
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buf += 4 - s->profile;
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buf += 4 - s->profile;
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buf_size -= 4 - s->profile;
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buf_size -= 4 - s->profile;
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