svq3: Check negative mb_type to fix potential crash.
authorBaptiste Coudurier <baptiste.coudurier@gmail.com>
Thu, 5 May 2011 01:45:36 +0000 (18:45 -0700)
committerDiego Biurrun <diego@biurrun.de>
Fri, 3 Jun 2011 11:55:55 +0000 (13:55 +0200)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Diego Biurrun <diego@biurrun.de>
libavcodec/svq3.c

index b55fa52..7cde5e5 100644 (file)
@@ -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;
             }