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>
14 years ago · 93d06bd1df
parent 8dfc6d1f7c
commit 93d06bd1df
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/svq3.c
+++ b/libavcodec/svq3.c
@ -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;
            }