diff --git a/libavcodec/cri.c b/libavcodec/cri.c
index 0558d0c8dd..d2d80b6f1c 100644
--- a/libavcodec/cri.c
+++ b/libavcodec/cri.c
@@ -236,10 +236,14 @@ static int cri_decode_frame(AVCodecContext *avctx, void *data,
             s->data_size = length;
             goto skip;
         case 105:
+            if (length <= 0)
+                return AVERROR_INVALIDDATA;
             hflip = bytestream2_get_byte(gb) != 0;
             length--;
             goto skip;
         case 106:
+            if (length <= 0)
+                return AVERROR_INVALIDDATA;
             vflip = bytestream2_get_byte(gb) != 0;
             length--;
             goto skip;