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| author | Eric Dumazet <edumazet@google.com> | 2019-04-23 09:43:26 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-04-26 11:18:23 -0400 |
| commit | c1c477217882c610a2ba0268f5faf36c9c092528 (patch) | |
| tree | 13627eea67bb686b9ad6742fb66c1ce0615f2211 /net/l2tp | |
| parent | ad759c906954aab1bab8b5fe04931e566d901a0e (diff) | |
| download | linux-c1c477217882c610a2ba0268f5faf36c9c092528.tar.gz linux-c1c477217882c610a2ba0268f5faf36c9c092528.tar.bz2 linux-c1c477217882c610a2ba0268f5faf36c9c092528.zip | |
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: d00fa9adc528 ("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>
Diffstat (limited to 'net/l2tp')
| -rw-r--r-- | net/l2tp/l2tp_core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index fed6becc5daf..aee33d132018 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -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; |