[PATCH 5.15 034/356] af_unix: Use skb_queue_len_lockless() in sk_diag_show_rqlen().

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

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

From: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>

[ Upstream commit 5d915e584d8408211d4567c22685aae8820bfc55 ]

We can dump the socket queue length via UNIX_DIAG by specifying
UDIAG_SHOW_RQLEN.

If sk->sk_state is TCP_LISTEN, we return the recv queue length,
but here we do not hold recvq lock.

Let's use skb_queue_len_lockless() in sk_diag_show_rqlen().

Fixes: c9da99e6475f ("unix_diag: Fixup RQLEN extension report")
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/unix/diag.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -103,7 +103,7 @@ static int sk_diag_show_rqlen(struct soc
 	struct unix_diag_rqlen rql;
 
 	if (READ_ONCE(sk->sk_state) == TCP_LISTEN) {
-		rql.udiag_rqueue = sk->sk_receive_queue.qlen;
+		rql.udiag_rqueue = skb_queue_len_lockless(&sk->sk_receive_queue);
 		rql.udiag_wqueue = sk->sk_max_ack_backlog;
 	} else {
 		rql.udiag_rqueue = (u32) unix_inq_len(sk);






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