diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index d96a610929d9abe074e69423ef757f6e9d6f7b4d..438f45222ca564e1099b2c36cd7a72c42b581675 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -570,7 +570,9 @@ static int netlink_insert(struct sock *sk, u32 portid)
 	if (nlk_sk(sk)->bound)
 		goto err;
 
-	nlk_sk(sk)->portid = portid;
+	/* portid can be read locklessly from netlink_getname(). */
+	WRITE_ONCE(nlk_sk(sk)->portid, portid);
+
 	sock_hold(sk);
 
 	err = __netlink_insert(table, sk);
@@ -1124,7 +1126,8 @@ static int netlink_getname(struct socket *sock, struct sockaddr *addr,
 		nladdr->nl_pid = nlk->dst_portid;
 		nladdr->nl_groups = netlink_group_mask(nlk->dst_group);
 	} else {
-		nladdr->nl_pid = nlk->portid;
+		/* Paired with WRITE_ONCE() in netlink_insert() */
+		nladdr->nl_pid = READ_ONCE(nlk->portid);
 		netlink_lock_table();
 		nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0;
 		netlink_unlock_table();