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svq3: protect against negative quantizers.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Ronald S. Bultje 2012-03-05 17:03:32 -08:00
parent c23acbaed4
commit 11b940a1a8

View File

@ -650,7 +650,7 @@ static int svq3_decode_mb(SVQ3Context *svq3, unsigned int mb_type)
if (IS_INTRA16x16(mb_type) || (s->pict_type != AV_PICTURE_TYPE_I && s->adaptive_quant && cbp)) { if (IS_INTRA16x16(mb_type) || (s->pict_type != AV_PICTURE_TYPE_I && s->adaptive_quant && cbp)) {
s->qscale += svq3_get_se_golomb(&s->gb); s->qscale += svq3_get_se_golomb(&s->gb);
if (s->qscale > 31){ if (s->qscale > 31u){
av_log(h->s.avctx, AV_LOG_ERROR, "qscale:%d\n", s->qscale); av_log(h->s.avctx, AV_LOG_ERROR, "qscale:%d\n", s->qscale);
return -1; return -1;
} }