diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index f574997687..60c1a714a6 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -1846,6 +1846,8 @@ static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
         }
     }
 eos: // end of slice
+    if (get_bits_left(&s->gb) < 0)
+        return AVERROR_INVALIDDATA;
     *buf += (get_bits_count(&s->gb)-1)/8;
     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
     return 0;