diff --git a/libavcodec/indeo2.c b/libavcodec/indeo2.c
index a58dfa0910..c89845233e 100644
--- a/libavcodec/indeo2.c
+++ b/libavcodec/indeo2.c
@@ -172,6 +172,12 @@ static int ir2_decode_frame(AVCodecContext *avctx,
 
     ltab = buf[0x22] & 3;
     ctab = buf[0x22] >> 2;
+
+    if (ctab > 3) {
+        av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
+        return AVERROR_INVALIDDATA;
+    }
+
     if (s->decode_delta) { /* intraframe */
         if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
                                     p->data[0], p->linesize[0],