netdev - [PATCH net-next 18/20] tcp: check local var (timeo) before socket fields in one test

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Message-Id: <20211115190249.3936899-19-eric.dumazet@gmail.com>
Date:   Mon, 15 Nov 2021 11:02:47 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Arjun Roy <arjunroy@...gle.com>
Subject: [PATCH net-next 18/20] tcp: check local var (timeo) before socket fields in one test

From: Eric Dumazet <edumazet@...gle.com>

Testing timeo before sk_err/sk_state/sk_shutdown makes more sense.

Modern applications use non-blocking IO, while a socket is terminated
only once during its life time.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv4/tcp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 33cd9a1c199cef9822ec0ddb3aec91c1111754c7..7b1886103556e1295d84378d5bcb0f0346651de0 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2399,10 +2399,10 @@ static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len,
 			break;
 
 		if (copied) {
-			if (sk->sk_err ||
+			if (!timeo ||
+			    sk->sk_err ||
 			    sk->sk_state == TCP_CLOSE ||
 			    (sk->sk_shutdown & RCV_SHUTDOWN) ||
-			    !timeo ||
 			    signal_pending(current))
 				break;
 		} else {
-- 
2.34.0.rc1.387.gb447b232ab-goog