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authorZiyang Xuan <william.xuanziyang@huawei.com>2022-09-15 09:08:35 +0800
committerDavid S. Miller <davem@davemloft.net>2022-09-21 12:59:22 +0100
commit63b7c2ebcc1d69bbf19e7418ef6c2496364f0ce2 (patch)
treeefe2937b3518dbf1c7c9973b0d34e59fa88863c1 /net/packet
parent2a566f0148bad759ba6f3758914edda1a8a4181f (diff)
net/af_packet: registration process optimization in packet_init()
Now, register_pernet_subsys() and register_netdevice_notifier() are both after sock_register(). It can create PF_PACKET socket and process socket once sock_register() successfully. It is possible PF_PACKET socket is creating but register_pernet_subsys() and register_netdevice_notifier() are not registered yet. Thus net->packet.sklist_lock and net->packet.sklist will be accessed without initialization that is done in packet_net_init(). Although this is a low probability scenario. Move register_pernet_subsys() and register_netdevice_notifier() to the front in packet_init(). Correspondingly, adjust the unregister process in packet_exit(). Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c26
1 files changed, 13 insertions, 13 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 7de46d831349..d3f6db350de7 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -4725,37 +4725,37 @@ static struct pernet_operations packet_net_ops = {
static void __exit packet_exit(void)
{
- unregister_netdevice_notifier(&packet_netdev_notifier);
- unregister_pernet_subsys(&packet_net_ops);
sock_unregister(PF_PACKET);
proto_unregister(&packet_proto);
+ unregister_netdevice_notifier(&packet_netdev_notifier);
+ unregister_pernet_subsys(&packet_net_ops);
}
static int __init packet_init(void)
{
int rc;
- rc = proto_register(&packet_proto, 0);
- if (rc)
- goto out;
- rc = sock_register(&packet_family_ops);
- if (rc)
- goto out_proto;
rc = register_pernet_subsys(&packet_net_ops);
if (rc)
- goto out_sock;
+ goto out;
rc = register_netdevice_notifier(&packet_netdev_notifier);
if (rc)
goto out_pernet;
+ rc = proto_register(&packet_proto, 0);
+ if (rc)
+ goto out_notifier;
+ rc = sock_register(&packet_family_ops);
+ if (rc)
+ goto out_proto;
return 0;
-out_pernet:
- unregister_pernet_subsys(&packet_net_ops);
-out_sock:
- sock_unregister(PF_PACKET);
out_proto:
proto_unregister(&packet_proto);
+out_notifier:
+ unregister_netdevice_notifier(&packet_netdev_notifier);
+out_pernet:
+ unregister_pernet_subsys(&packet_net_ops);
out:
return rc;
}