netdev - [PATCH v1 net-next 03/15] af_unix: Set error only when needed in unix_stream

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Message-ID: <20241206052607.1197-4-kuniyu@amazon.com>
Date: Fri, 6 Dec 2024 14:25:55 +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>
CC: Kuniyuki Iwashima <kuniyu@...zon.com>, Kuniyuki Iwashima
	<kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v1 net-next 03/15] af_unix: Set error only when needed in unix_stream_sendmsg().

We will introduce skb drop reason for AF_UNIX, then we need to
set an errno and a drop reason for each path.

Let's set an error only when it's needed in unix_stream_sendmsg().

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 net/unix/af_unix.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index bdf88ddfb3e4..8d13b580731c 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2254,8 +2254,8 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
 
 	wait_for_unix_gc(scm.fp);
 
-	err = -EOPNOTSUPP;
 	if (msg->msg_flags & MSG_OOB) {
+		err = -EOPNOTSUPP;
 #if IS_ENABLED(CONFIG_AF_UNIX_OOB)
 		if (len)
 			len--;
@@ -2268,10 +2268,11 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
 		err = READ_ONCE(sk->sk_state) == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP;
 		goto out_err;
 	} else {
-		err = -ENOTCONN;
 		other = unix_peer(sk);
-		if (!other)
+		if (!other) {
+			err = -ENOTCONN;
 			goto out_err;
+		}
 	}
 
 	if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN)
-- 
2.39.5 (Apple Git-154)