netdev - [PATCH net-next] ipvs: properly dereference pe in ip_vs_add

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Message-Id: <20240626081159.1405-1-chenhx.fnst@fujitsu.com>
Date: Wed, 26 Jun 2024 16:11:59 +0800
From: Chen Hanxiao <chenhx.fnst@...itsu.com>
To: Simon Horman <horms@...ge.net.au>,
	Julian Anastasov <ja@....bg>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Jozsef Kadlecsik <kadlec@...filter.org>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: [PATCH net-next] ipvs: properly dereference pe in ip_vs_add_service

Use rcu_dereference_protected to resolve sparse warning:

  net/netfilter/ipvs/ip_vs_ctl.c:1471:27: warning: dereference of noderef expression

Fixes: 39b972231536 ("ipvs: handle connections started by real-servers")
Signed-off-by: Chen Hanxiao <chenhx.fnst@...itsu.com>
---
 net/netfilter/ipvs/ip_vs_ctl.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index b6d0dcf3a5c3..925e2143ba15 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -1369,7 +1369,7 @@ ip_vs_add_service(struct netns_ipvs *ipvs, struct ip_vs_service_user_kern *u,
 {
 	int ret = 0;
 	struct ip_vs_scheduler *sched = NULL;
-	struct ip_vs_pe *pe = NULL;
+	struct ip_vs_pe *pe = NULL, *tmp_pe = NULL;
 	struct ip_vs_service *svc = NULL;
 	int ret_hooks = -1;
 
@@ -1468,7 +1468,8 @@ ip_vs_add_service(struct netns_ipvs *ipvs, struct ip_vs_service_user_kern *u,
 		atomic_inc(&ipvs->ftpsvc_counter);
 	else if (svc->port == 0)
 		atomic_inc(&ipvs->nullsvc_counter);
-	if (svc->pe && svc->pe->conn_out)
+	tmp_pe = rcu_dereference_protected(svc->pe, 1);
+	if (tmp_pe && tmp_pe->conn_out)
 		atomic_inc(&ipvs->conn_out_counter);
 
 	/* Count only IPv4 services for old get/setsockopt interface */
-- 
2.39.1