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h264: check for invalid zeros_left before writing 

Prevent an invalid write into coeffs[scantable[-1]] if zeros_left
itself was an invalid VLC code (and thus -1).

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Ronald S. Bultje 2012-12-07 13:09:20 -08:00 committed by Luca Barbato
parent 9a2e79116d
commit ddd7559ad9
1 changed files with 6 additions and 5 deletions
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11
libavcodec/h264_cavlc.c
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@ -610,17 +610,18 @@ static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, in
} \
}
if (zeros_left < 0) {
av_log(h->s.avctx, AV_LOG_ERROR,
"negative number of zero coeffs at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
if (h->pixel_shift) {
STORE_BLOCK(int32_t)
} else {
STORE_BLOCK(int16_t)
}
if(zeros_left<0){
av_log(h->s.avctx, AV_LOG_ERROR, "negative number of zero coeffs at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
return 0;
}