summaryrefslogtreecommitdiff
path: root/net/core
diff options
context:
space:
mode:
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/core
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/core')
-rw-r--r--net/core/fib_rules.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 44706e81b2e0..e4fdc9dfb2c7 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -175,9 +175,9 @@ void fib_rules_unregister(struct fib_rules_ops *ops)
spin_lock(&net->rules_mod_lock);
list_del_rcu(&ops->list);
- fib_rules_cleanup_ops(ops);
spin_unlock(&net->rules_mod_lock);
+ fib_rules_cleanup_ops(ops);
call_rcu(&ops->rcu, fib_rules_put_rcu);
}
EXPORT_SYMBOL_GPL(fib_rules_unregister);