diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 208da9a9909c..37ff6766fd52 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3753,6 +3753,11 @@ static int mptcp_listen(struct socket *sock, int backlog)
 	pr_debug("msk=%p", msk);
 
 	lock_sock(sk);
+
+	err = -EINVAL;
+	if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
+		goto unlock;
+
 	ssock = __mptcp_nmpc_socket(msk);
 	if (!ssock) {
 		err = -EINVAL;