diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index 085020938a..832ba4c111 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -614,7 +614,13 @@ static void rotate_luts(VC1Context *v)
 }
 
 static int read_bfraction(VC1Context *v, GetBitContext* gb) {
-    v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
+    int bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
+
+    if (bfraction_lut_index == 21 || bfraction_lut_index < 0) {
+        av_log(v->s.avctx, AV_LOG_ERROR, "bfraction invalid\n");
+        return AVERROR_INVALIDDATA;
+    }
+    v->bfraction_lut_index = bfraction_lut_index;
     v->bfraction           = ff_vc1_bfraction_lut[v->bfraction_lut_index];
     return 0;
 }