diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index b8b0e73dab..f5580bfafb 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -5606,6 +5606,10 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
                 s->end_mb_y = (i == n_slices     ) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);
             else
                 s->end_mb_y = (i <= n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);
+            if (s->end_mb_y <= s->start_mb_y) {
+                av_log(v->s.avctx, AV_LOG_ERROR, "end mb y %d %d invalid\n", s->end_mb_y, s->start_mb_y);
+                continue;
+            }
             vc1_decode_blocks(v);
             if (i != n_slices)
                 s->gb = slices[i].gb;