Don't read out-of-bounds values.

Originally committed as revision 5650 to svn://svn.ffmpeg.org/ffmpeg/trunk
19 years ago · 928dc49d0e
parent 1ede1725f1
commit 928dc49d0e
1 changed files with 2 additions and 1 deletions
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@ -2511,7 +2511,8 @@ static int vc1_decode_p_mb(VC1Context *v, DCTELEM block[6][64])
                int intrapred = 0;
                for(i=0; i<6; i++)
                    if(is_intra[i]) {
-                        if(v->mb_type[0][s->block_index[i] - s->block_wrap[i]] || v->mb_type[0][s->block_index[i] - 1]) {
+                        if(((s->mb_y || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])
+                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {
                            intrapred = 1;
                            break;
                        }