ndex,
 
 static inline int ip6_sock_set_v6only(struct sock *sk)
 {
-	if (inet_sk(sk)->inet_num)
-		return -EINVAL;
+	int ret = 0;
+
 	lock_sock(sk);
-	sk->sk_ipv6only = true;
+	if (inet_sk(sk)->inet_num)
+		ret = -EINVAL;
+	else
+		sk->sk_ipv6only = true;
 	release_sock(sk);
-	return 0;
+	return ret;
 }
 
 static inline void ip6_sock_set_recverr(struct sock *sk)
-- 
2.51.0[PATCH 6.19 669/781] ipv6: fix a race in ip6_sock_set_v6only()Greg Kroah-Hartman <gregkh@linuxfoundation.org> undefinedstable@vger.kernel.org undefined undefined undefined undefined undefined undefined undefined”