5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
[ Upstream commit efaf24e30ec39ebbea9112227485805a48b0ceb1 ]
While dumping sockets via UNIX_DIAG, we do not hold unix_state_lock().
Let's use READ_ONCE() to read sk->sk_shutdown.
Fixes: e4e541a84863 ("sock-diag: Report shutdown for inet and unix sockets (v2)")
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 5bc5cb83cc6e4..7066a36234106 100644
--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -164,7 +164,7 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_r
sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
goto out_nlmsg_trim;
- if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
+ if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, READ_ONCE(sk->sk_shutdown)))
goto out_nlmsg_trim;
if ((req->udiag_show & UDIAG_SHOW_UID) &&
--
2.43.0
