5.4-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(-)
diff --git a/net/unix/diag.c b/net/unix/diag.c
index 4666fabb04933..5bc5cb83cc6e4 100644
--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -103,7 +103,7 @@ static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
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);
--
2.43.0
