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: d00fa9adc5
("il2tp: fix races with tunnel socket close")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
ad759c9069
commit
c1c4772178
|
@ -909,7 +909,7 @@ int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
|
|||
{
|
||||
struct l2tp_tunnel *tunnel;
|
||||
|
||||
tunnel = l2tp_tunnel(sk);
|
||||
tunnel = rcu_dereference_sk_user_data(sk);
|
||||
if (tunnel == NULL)
|
||||
goto pass_up;
|
||||
|
||||
|
|
Loading…
Reference in New Issue