netdev - [PATCH stable,4.19 2/2] Revert "tcp: Clean up kernel listener's reqsk in inet_twsk

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Message-ID: <20240506032240.3170844-3-shaozhengchao@huawei.com>
Date: Mon, 6 May 2024 11:22:40 +0800
From: Zhengchao Shao <shaozhengchao@...wei.com>
To: <stable@...r.kernel.org>
CC: <netdev@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<davem@...emloft.net>, <kuznet@....inr.ac.ru>, <yoshfuji@...ux-ipv6.org>,
	<kuba@...nel.org>, <edumazet@...gle.com>, <kuniyu@...zon.com>,
	<weiyongjun1@...wei.com>, <yuehaibing@...wei.com>, <shaozhengchao@...wei.com>
Subject: [PATCH stable,4.19 2/2] Revert "tcp: Clean up kernel listener's reqsk in inet_twsk_purge()"

This reverts commit 9f06ebd1daf5914afb21b95781cf637a025e9f9a.

There's no "pernet" variable in the struct hashinfo. The "pernet" variable
is introduced from v6.1-rc1. Revert this patch.

Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
---
 net/ipv4/inet_timewait_sock.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 0ab4e0e28baf..88c5069b5d20 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -267,21 +267,8 @@ void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family)
 		rcu_read_lock();
 restart:
 		sk_nulls_for_each_rcu(sk, node, &head->chain) {
-			if (sk->sk_state != TCP_TIME_WAIT) {
-				/* A kernel listener socket might not hold refcnt for net,
-				 * so reqsk_timer_handler() could be fired after net is
-				 * freed.  Userspace listener and reqsk never exist here.
-				 */
-				if (unlikely(sk->sk_state == TCP_NEW_SYN_RECV &&
-					     hashinfo->pernet)) {
-					struct request_sock *req = inet_reqsk(sk);
-
-					inet_csk_reqsk_queue_drop_and_put(req->rsk_listener, req);
-				}
-
+			if (sk->sk_state != TCP_TIME_WAIT)
 				continue;
-			}
-
 			tw = inet_twsk(sk);
 			if ((tw->tw_family != family) ||
 				refcount_read(&twsk_net(tw)->count))
-- 
2.34.1