1 files changed, 5 insertions, 0 deletions

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index bcb5def2b09e..7e4d9c871153 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);
         }