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gre: fix netns vs proto registration ordering 

GRE protocol receive hook can be called right after protocol addition is done.
If netns stuff is not yet initialized, we're going to oops in
net_generic().

This is remotely oopsable if ip_gre is compiled as module and packet
comes at unfortunate moment of module loading.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Dobriyan 2010-02-16 07:57:44 +00:00 committed by David S. Miller
parent 749f621e20
commit c2892f0271
1 changed files with 10 additions and 9 deletions
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19
net/ipv4/ip_gre.c
View File

@ -1665,14 +1665,15 @@ static int __init ipgre_init(void)
printk(KERN_INFO "GRE over IPv4 tunneling driver\n");
if (inet_add_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) {
printk(KERN_INFO "ipgre init: can't add protocol\n");
return -EAGAIN;
}
err = register_pernet_device(&ipgre_net_ops);
if (err < 0)
goto gen_device_failed;
return err;
err = inet_add_protocol(&ipgre_protocol, IPPROTO_GRE);
if (err < 0) {
printk(KERN_INFO "ipgre init: can't add protocol\n");
goto add_proto_failed;
}
err = rtnl_link_register(&ipgre_link_ops);
if (err < 0)
@ -1688,9 +1689,9 @@ out:
tap_ops_failed:
rtnl_link_unregister(&ipgre_link_ops);
rtnl_link_failed:
unregister_pernet_device(&ipgre_net_ops);
gen_device_failed:
inet_del_protocol(&ipgre_protocol, IPPROTO_GRE);
add_proto_failed:
unregister_pernet_device(&ipgre_net_ops);
goto out;
}
@ -1698,9 +1699,9 @@ static void __exit ipgre_fini(void)
{
rtnl_link_unregister(&ipgre_tap_ops);
rtnl_link_unregister(&ipgre_link_ops);
unregister_pernet_device(&ipgre_net_ops);
if (inet_del_protocol(&ipgre_protocol, IPPROTO_GRE) < 0)
printk(KERN_INFO "ipgre close: can't remove protocol\n");
unregister_pernet_device(&ipgre_net_ops);
}
module_init(ipgre_init);