On 2022/10/31 18:35, Julian Anastasov wrote:
Hello,
On Mon, 31 Oct 2022, Zhengchao Shao wrote:
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
Good catch. But can you add some #ifdef CONFIG_PROC_FS
as done in commit 4bc3c8dc9f5f ("ipvs: fix possible memory leak in
ip_vs_control_net_init") ? You can also extend it to include
ifdefs and ENOMEM in ip_vs_app.c:ip_vs_app_net_init(). If you
prefer, it can be a separate patch.
Regards
--
Julian Anastasov <ja@xxxxxx>
Hi Anastasov:
Thank you for your reply. I'd like to do it, and I will
send them in v2.
Zhengchao Shao
