diff --git a/net/socket.c b/net/socket.c
index 4006452..cc3fc4d 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1907,6 +1907,10 @@
 {
 	if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
 		return -EFAULT;
+
+	if (kmsg->msg_namelen < 0)
+		return -EINVAL;
+
 	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
 		kmsg->msg_namelen = sizeof(struct sockaddr_storage);
 	return 0;