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

[Chen Hanxiao <chenhx.fnst@xxxxxxxxxxx>]

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@xxxxxxxxxxx>
---
 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