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svq3: protect against negative quantizers.

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit 11b940a1a8)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Ronald S. Bultje 2012-03-05 17:03:32 -08:00 committed by Reinhard Tartler
parent 853ce33dbc
commit 6dfe865aed
1 changed files with 1 additions and 1 deletions
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2
libavcodec/svq3.c
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@ -649,7 +649,7 @@ 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)) {
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);
return -1;
}