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-rw-r--r--net/ipv4/udp.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index bcb5def2b09..7e4d9c87115 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -189,6 +189,11 @@ int udp_lib_get_port(struct sock *sk, unsigned short snum,
inet_sk(sk)->num = snum;
sk->sk_hash = snum;
if (sk_unhashed(sk)) {
+ /*
+ * We need that previous write to sk->sk_hash committed
+ * before write to sk->next done in following add_node() variant
+ */
+ smp_wmb();
sk_add_node_rcu(sk, &hslot->head);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
}