Commit c1c47721 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller

l2tp: use rcu_dereference_sk_user_data() in l2tp_udp_encap_recv()

Canonical way to fetch sk_user_data from an encap_rcv() handler called
from UDP stack in rcu protected section is to use rcu_dereference_sk_user_data(),
otherwise compiler might read it multiple times.

Fixes: d00fa9ad ("il2tp: fix races with tunnel socket close")
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ad759c90
...@@ -909,7 +909,7 @@ int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) ...@@ -909,7 +909,7 @@ int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
{ {
struct l2tp_tunnel *tunnel; struct l2tp_tunnel *tunnel;
tunnel = l2tp_tunnel(sk); tunnel = rcu_dereference_sk_user_data(sk);
if (tunnel == NULL) if (tunnel == NULL)
goto pass_up; goto pass_up;
......
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