linux-kernel - [PATCH net] tcp: Use WARN_ON_ONCE() in tcp_read

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Message-Id: <20220908231523.8977-1-yepeilin.cs@gmail.com>
Date:   Thu,  8 Sep 2022 16:15:23 -0700
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Peilin Ye <peilin.ye@...edance.com>,
        Cong Wang <cong.wang@...edance.com>,
        Jakub Sitnicki <jakub@...udflare.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Peilin Ye <yepeilin.cs@...il.com>
Subject: [PATCH net] tcp: Use WARN_ON_ONCE() in tcp_read_skb()

From: Peilin Ye <peilin.ye@...edance.com>

Prevent tcp_read_skb() from flooding the syslog.

Suggested-by: Jakub Sitnicki <jakub@...udflare.com>
Signed-off-by: Peilin Ye <peilin.ye@...edance.com>
---
 net/ipv4/tcp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 8230be00ecca..9251c99d3cfd 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1766,7 +1766,7 @@ int tcp_read_skb(struct sock *sk, skb_read_actor_t recv_actor)
 		return 0;
 
 	__skb_unlink(skb, &sk->sk_receive_queue);
-	WARN_ON(!skb_set_owner_sk_safe(skb, sk));
+	WARN_ON_ONCE(!skb_set_owner_sk_safe(skb, sk));
 	copied = recv_actor(sk, skb);
 	if (copied >= 0) {
 		seq += copied;
-- 
2.20.1