diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index 0e3de6e2e6..840e9b32e9 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -662,6 +662,10 @@ smv_retry:
                 goto smv_out;
             }
             size = avio_rl24(s->pb);
+            if (size > wav->smv_block_size) {
+                ret = AVERROR_EOF;
+                goto smv_out;
+            }
             ret  = av_get_packet(s->pb, pkt, size);
             if (ret < 0)
                 goto smv_out;