[PATCH net] ipvs: fix WARNING in __ip_vs_cleanup_batch()

[Zhengchao Shao <shaozhengchao@xxxxxxxxxx>]

During the initialization of ip_vs_conn_net_init(), if file ip_vs_conn
or ip_vs_conn_sync fails to be created, the initialization is successful
by default. Therefore, the ip_vs_conn or ip_vs_conn_sync file doesn't
be found during the remove.

The following is the stack information:
name 'ip_vs_conn_sync'
WARNING: CPU: 3 PID: 9 at fs/proc/generic.c:712
remove_proc_entry+0x389/0x460
Modules linked in:
Workqueue: netns cleanup_net
RIP: 0010:remove_proc_entry+0x389/0x460
Call Trace:
<TASK>
__ip_vs_cleanup_batch+0x7d/0x120
ops_exit_list+0x125/0x170
cleanup_net+0x4ea/0xb00
process_one_work+0x9bf/0x1710
worker_thread+0x665/0x1080
kthread+0x2e4/0x3a0
ret_from_fork+0x1f/0x30
</TASK>

Fixes: 61b1ab4583e2 ("IPVS: netns, add basic init per netns.")
Signed-off-by: Zhengchao Shao <shaozhengchao@xxxxxxxxxx>
---
 net/netfilter/ipvs/ip_vs_conn.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c
index 8c04bb57dd6f..b126bd7df321 100644
--- a/net/netfilter/ipvs/ip_vs_conn.c
+++ b/net/netfilter/ipvs/ip_vs_conn.c
@@ -1447,12 +1447,22 @@ int __net_init ip_vs_conn_net_init(struct netns_ipvs 
*ipvs)
 {
        atomic_set(&ipvs->conn_count, 0);
 
-       proc_create_net("ip_vs_conn", 0, ipvs->net->proc_net,
-                       &ip_vs_conn_seq_ops, sizeof(struct ip_vs_iter_state));
-       proc_create_net("ip_vs_conn_sync", 0, ipvs->net->proc_net,
-                       &ip_vs_conn_sync_seq_ops,
-                       sizeof(struct ip_vs_iter_state));
+       if (!proc_create_net("ip_vs_conn", 0, ipvs->net->proc_net,
+                            &ip_vs_conn_seq_ops,
+                            sizeof(struct ip_vs_iter_state)))
+               goto err_conn;
+
+       if (!proc_create_net("ip_vs_conn_sync", 0, ipvs->net->proc_net,
+                            &ip_vs_conn_sync_seq_ops,
+                            sizeof(struct ip_vs_iter_state)))
+               goto err_conn_sync;
+
        return 0;
+
+err_conn_sync:
+       remove_proc_entry("ip_vs_conn", ipvs->net->proc_net);
+err_conn:
+       return -ENOMEM;
 }
 
 void __net_exit ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs)
-- 
2.17.1