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ipvs: fix WARNING in ip_vs_app_net_cleanup()

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During the initialization of ip_vs_app_net_init(), if file ip_vs_app
fails to be created, the initialization is successful by default.
Therefore, the ip_vs_app file doesn't be found during the remove in
ip_vs_app_net_cleanup(). It will cause WRNING.

The following is the stack information:
name 'ip_vs_app'
WARNING: CPU: 1 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>
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: 457c4cbc5a3d ("[NET]: Make /proc/net per network namespace")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Zhengchao Shao 2022-10-31 20:07:05 +08:00 committed by Pablo Neira Ayuso
parent 3d00c6a0da
commit 5663ed63ad
1 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
net/netfilter/ipvs/ip_vs_app.c
View File

@ -599,13 +599,19 @@ static const struct seq_operations ip_vs_app_seq_ops = {
int __net_init ip_vs_app_net_init(struct netns_ipvs *ipvs)
{
INIT_LIST_HEAD(&ipvs->app_list);
proc_create_net("ip_vs_app", 0, ipvs->net->proc_net, &ip_vs_app_seq_ops,
sizeof(struct seq_net_private));
#ifdef CONFIG_PROC_FS
if (!proc_create_net("ip_vs_app", 0, ipvs->net->proc_net,
&ip_vs_app_seq_ops,
sizeof(struct seq_net_private)))
return -ENOMEM;
#endif
return 0;
}
void __net_exit ip_vs_app_net_cleanup(struct netns_ipvs *ipvs)
{
unregister_ip_vs_app(ipvs, NULL /* all */);
#ifdef CONFIG_PROC_FS
remove_proc_entry("ip_vs_app", ipvs->net->proc_net);
#endif
}