avcodec/av1dec: Return error for unsupported tile list OBU

Otherwise decoding maybe successful but output result is incorrect.
Signed-off-by: Fei Wang <fei.w.wang@intel.com>

libavcodec/av1dec.c

@@ -1202,6 +1202,12 @@ static int av1_receive_frame_internal(AVCodecContext *avctx, AVFrame *frame)
 
         av_log(avctx, AV_LOG_DEBUG, "OBU idx:%d, type:%d, content available:%d.\n", i, unit->type, !!obu);
 
+        if (unit->type == AV1_OBU_TILE_LIST) {
+            av_log(avctx, AV_LOG_ERROR, "Large scale tile decoding is unsupported.\n");
+            ret = AVERROR_PATCHWELCOME;
+            goto end;
+        }
+
         if (!obu)
             continue;