netdev - [PATCH net-next v2] unix: Improve locking scheme in unix_show

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Date:   Sat, 14 Jan 2023 12:35:02 +0300
From:   Kirill Tkhai <tkhai@...ru>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, kuniyu@...zon.com, netdev@...r.kernel.org,
        tkhai@...ru
Subject: [PATCH net-next v2] unix: Improve locking scheme in
 unix_show_fdinfo()

After switching to TCP_ESTABLISHED or TCP_LISTEN sk_state, alive SOCK_STREAM
and SOCK_SEQPACKET sockets can't change it anymore (since commit 3ff8bff704f4
"unix: Fix race in SOCK_SEQPACKET's unix_dgram_sendmsg()").

Thus, we do not need to take lock here.

Signed-off-by: Kirill Tkhai <tkhai@...ru>
---
v2: Initialize "nr_fds = 0".

 net/unix/af_unix.c |   20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index f0c2293f1d3b..009616fa0256 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -807,23 +807,23 @@ static int unix_count_nr_fds(struct sock *sk)
 static void unix_show_fdinfo(struct seq_file *m, struct socket *sock)
 {
 	struct sock *sk = sock->sk;
+	unsigned char s_state;
 	struct unix_sock *u;
-	int nr_fds;
+	int nr_fds = 0;
 
 	if (sk) {
+		s_state = READ_ONCE(sk->sk_state);
 		u = unix_sk(sk);
-		if (sock->type == SOCK_DGRAM) {
-			nr_fds = atomic_read(&u->scm_stat.nr_fds);
-			goto out_print;
-		}
 
-		unix_state_lock(sk);
-		if (sk->sk_state != TCP_LISTEN)
+		/* SOCK_STREAM and SOCK_SEQPACKET sockets never change their
+		 * sk_state after switching to TCP_ESTABLISHED or TCP_LISTEN.
+		 * SOCK_DGRAM is ordinary. So, no lock is needed.
+		 */
+		if (sock->type == SOCK_DGRAM || s_state == TCP_ESTABLISHED)
 			nr_fds = atomic_read(&u->scm_stat.nr_fds);
-		else
+		else if (s_state == TCP_LISTEN)
 			nr_fds = unix_count_nr_fds(sk);
-		unix_state_unlock(sk);
-out_print:
+
 		seq_printf(m, "scm_fds: %u\n", nr_fds);
 	}
 }