[PATCH 6.6 140/267] af_unix: Annotate data-race of sk->sk_state in unix_accept().

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6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>

[ Upstream commit 1b536948e805aab61a48c5aa5db10c9afee880bd ]

Once sk->sk_state is changed to TCP_LISTEN, it never changes.

unix_accept() takes the advantage and reads sk->sk_state without
holding unix_state_lock().

Let's use READ_ONCE() there.

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(-)

--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1710,7 +1710,7 @@ static int unix_accept(struct socket *so
 		goto out;
 
 	err = -EINVAL;
-	if (sk->sk_state != TCP_LISTEN)
+	if (READ_ONCE(sk->sk_state) != TCP_LISTEN)
 		goto out;
 
 	/* If socket state is TCP_LISTEN it cannot change (for now...),






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