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ipv6: fix WARNING in ip6_route_net_exit_late() 

During the initialization of ip6_route_net_init_late(), if file
ipv6_route or rt6_stats fails to be created, the initialization is
successful by default. Therefore, the ipv6_route or rt6_stats file
doesn't be found during the remove in ip6_route_net_exit_late(). It
will cause WRNING.

The following is the stack information:
name 'rt6_stats'
WARNING: CPU: 0 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
PKRU: 55555554
Call Trace:
<TASK>
ops_exit_list+0xb0/0x170
cleanup_net+0x4ea/0xb00
process_one_work+0x9bf/0x1710
worker_thread+0x665/0x1080
kthread+0x2e4/0x3a0
ret_from_fork+0x1f/0x30
</TASK>

Fixes: cdb1876192 ("[NETNS][IPV6] route6 - create route6 proc files for the namespace")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20221102020610.351330-1-shaozhengchao@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Zhengchao Shao 2022-11-02 10:06:10 +08:00 committed by Jakub Kicinski
parent 628ac04a75
commit 768b3c745f
1 changed files with 10 additions and 4 deletions
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14
net/ipv6/route.c
View File

@ -6555,10 +6555,16 @@ static void __net_exit ip6_route_net_exit(struct net *net)
static int __net_init ip6_route_net_init_late(struct net *net)
{
#ifdef CONFIG_PROC_FS
proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
sizeof(struct ipv6_route_iter));
proc_create_net_single("rt6_stats", 0444, net->proc_net,
rt6_stats_seq_show, NULL);
if (!proc_create_net("ipv6_route", 0, net->proc_net,
&ipv6_route_seq_ops,
sizeof(struct ipv6_route_iter)))
return -ENOMEM;
if (!proc_create_net_single("rt6_stats", 0444, net->proc_net,
rt6_stats_seq_show, NULL)) {
remove_proc_entry("ipv6_route", net->proc_net);
return -ENOMEM;
}
#endif
return 0;
}