linux-kernel - [PATCH net] udp: Use WARN_ON_ONCE() in udp_read

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Date:   Tue, 20 Sep 2022 17:59:15 -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>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Alexei Starovoitov <ast@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Peilin Ye <yepeilin.cs@...il.com>
Subject: [PATCH net] udp: Use WARN_ON_ONCE() in udp_read_skb()

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

Prevent udp_read_skb() from flooding the syslog.

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

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index cd72158e953a..560d9eadeaa5 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1821,7 +1821,7 @@ int udp_read_skb(struct sock *sk, skb_read_actor_t recv_actor)
 			continue;
 		}
 
-		WARN_ON(!skb_set_owner_sk_safe(skb, sk));
+		WARN_ON_ONCE(!skb_set_owner_sk_safe(skb, sk));
 		used = recv_actor(sk, skb);
 		if (used <= 0) {
 			if (!copied)
-- 
2.20.1