4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
[ Upstream commit bd9f2d05731f6a112d0c7391a0d537bfc588dbe6 ]
net->unx.sysctl_max_dgram_qlen is exposed as a sysctl knob and can be
changed concurrently.
Let's use READ_ONCE() in unix_create1().
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/unix/af_unix.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index c01955ccf6b39..4a4b6d2544534 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -812,7 +812,7 @@ static struct sock *unix_create1(struct net *net, struct socket *sock, int kern)
sk->sk_allocation = GFP_KERNEL_ACCOUNT;
sk->sk_write_space = unix_write_space;
- sk->sk_max_ack_backlog = net->unx.sysctl_max_dgram_qlen;
+ sk->sk_max_ack_backlog = READ_ONCE(net->unx.sysctl_max_dgram_qlen);
sk->sk_destruct = unix_sock_destructor;
u = unix_sk(sk);
u->inflight = 0;
--
2.43.0
