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net: move fib_rules_unregister() under rtnl lock

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We have to hold rtnl lock for fib_rules_unregister()
otherwise the following race could happen:

fib_rules_unregister():	fib_nl_delrule():
...				...
...				ops = lookup_rules_ops();
list_del_rcu(&ops->list);
				list_for_each_entry(ops->rules) {
fib_rules_cleanup_ops(ops);	  ...
  list_del_rcu();		  list_del_rcu();
				}

Note, net->rules_mod_lock is actually not needed at all,
either upper layer netns code or rtnl lock guarantees
we are safe.

Cc: Alexander Duyck <[email protected]>
Cc: Thomas Graf <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
WANG Cong 2015-03-31 11:01:46 -07:00 • committed by David S. Miller
commit 419df12fb5
6 changed files with 8 additions and 5 deletions
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2
net/decnet/dn_rules.c
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@ -248,7 +248,9 @@ void __init dn_fib_rules_init(void)
void __exit dn_fib_rules_cleanup(void)
{
rtnl_lock();
fib_rules_unregister(dn_fib_rules_ops);
rtnl_unlock();
rcu_barrier();
}