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authorWANG Cong <xiyou.wangcong@gmail.com>2015-03-31 11:01:46 -0700
committerDavid S. Miller <davem@davemloft.net>2015-04-02 20:52:34 -0400
commit419df12fb5fa558451319276838c1842f2b11f8f (patch)
tree711c055fc40c8972b9f3cf91c572a00ca80ed7cb /net/decnet
parented785309c94445dd90e242370e1f7bb034e008fd (diff)
net: move fib_rules_unregister() under rtnl lock
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 <alexander.h.duyck@redhat.com> Cc: Thomas Graf <tgraf@suug.ch> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/decnet')
-rw-r--r--net/decnet/dn_rules.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
index faf7cc3483fe..9d66a0f72f90 100644
--- a/net/decnet/dn_rules.c
+++ b/net/decnet/dn_rules.c
@@ -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();
}

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