1 files changed, 4 insertions, 0 deletions
diff --git a/libavcodec/hevc.c b/libavcodec/hevc.c
index 2046267336..7ece31f8aa 100644
--- a/libavcodec/hevc.c
+++ b/libavcodec/hevc.c
@@ -2781,6 +2781,10 @@ static int decode_nal_unit(HEVCContext *s, const HEVCNAL *nal)
         }
 
         if (s->sh.first_slice_in_pic_flag) {
+            if (s->ref) {
+                av_log(s->avctx, AV_LOG_ERROR, "Two slices reporting being the first in the same frame.\n");
+                goto fail;
+            }
             ret = hevc_frame_start(s);
             if (ret < 0)
                 return ret;