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svq3: Check negative mb_type to fix potential crash. 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Diego Biurrun <diego@biurrun.de>
This commit is contained in:
Baptiste Coudurier 2011-05-04 18:45:36 -07:00 committed by Diego Biurrun
parent 8dfc6d1f7c
commit 93d06bd1df
1 changed files with 1 additions and 1 deletions
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2
libavcodec/svq3.c
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@ -1037,7 +1037,7 @@ static int svq3_decode_frame(AVCodecContext *avctx,
} else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4) {
mb_type += 4;
}
if (mb_type > 33 || svq3_decode_mb(svq3, mb_type)) {
if ((unsigned)mb_type > 33 || svq3_decode_mb(svq3, mb_type)) {
av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);
return -1;
}