netdev - [PATCH v1 net-next 06/12] af_unix: Reuse out_pipe label in unix_stream

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Message-ID: <20250110092641.85905-7-kuniyu@amazon.com>
Date: Fri, 10 Jan 2025 18:26:35 +0900
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Simon Horman <horms@...nel.org>
CC: Donald Hunter <donald.hunter@...hat.com>, Kuniyuki Iwashima
	<kuniyu@...zon.com>, Kuniyuki Iwashima <kuni1840@...il.com>,
	<netdev@...r.kernel.org>
Subject: [PATCH v1 net-next 06/12] af_unix: Reuse out_pipe label in unix_stream_sendmsg().

This is a follow-up of commit d460b04bc452 ("af_unix: Clean up
error paths in unix_stream_sendmsg().").

If we initialise skb with NULL in unix_stream_sendmsg(), we can
reuse the existing out_pipe label for the SEND_SHUTDOWN check.

Let's rename do it and adjust the existing label as out_pipe_lock.

While at it, size and data_len are moved to the while loop scope.

Suggested-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 net/unix/af_unix.c | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index b190ea8b8e9d..6505eeab9957 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2250,13 +2250,11 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
 			       size_t len)
 {
 	struct sock *sk = sock->sk;
+	struct sk_buff *skb = NULL;
 	struct sock *other = NULL;
-	int err, size;
-	struct sk_buff *skb;
-	int sent = 0;
 	struct scm_cookie scm;
 	bool fds_sent = false;
-	int data_len;
+	int err, sent = 0;
 
 	err = scm_send(sock, msg, &scm, false);
 	if (err < 0)
@@ -2285,16 +2283,12 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
 		}
 	}
 
-	if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN) {
-		if (!(msg->msg_flags & MSG_NOSIGNAL))
-			send_sig(SIGPIPE, current, 0);
-
-		err = -EPIPE;
-		goto out_err;
-	}
+	if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN)
+		goto out_pipe;
 
 	while (sent < len) {
-		size = len - sent;
+		int size = len - sent;
+		int data_len;
 
 		if (unlikely(msg->msg_flags & MSG_SPLICE_PAGES)) {
 			skb = sock_alloc_send_pskb(sk, 0, 0,
@@ -2347,7 +2341,7 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
 
 		if (sock_flag(other, SOCK_DEAD) ||
 		    (other->sk_shutdown & RCV_SHUTDOWN))
-			goto out_pipe;
+			goto out_pipe_unlock;
 
 		maybe_add_creds(skb, sock, other);
 		scm_stat_add(other, skb);
@@ -2370,8 +2364,9 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
 
 	return sent;
 
-out_pipe:
+out_pipe_unlock:
 	unix_state_unlock(other);
+out_pipe:
 	if (!sent && !(msg->msg_flags & MSG_NOSIGNAL))
 		send_sig(SIGPIPE, current, 0);
 	err = -EPIPE;
-- 
2.39.5 (Apple Git-154)