Make sure we only parse max amount of subpackets (5) in the cook decoder.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@18689 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/cook.c

@@ -1219,6 +1219,10 @@ static av_cold int cook_decode_init(AVCodecContext *avctx)
 
         q->num_subpackets++;
         s++;
+        if (s > MAX_SUBPACKETS) {
+            av_log(avctx,AV_LOG_ERROR,"Too many subpackets > 5, report file!\n");
+            return -1;
+        }
     }
     /* Generate tables */
     init_pow2table();