net: Move mutex_unlock() in cleanup_net() up
net_sem protects from pernet_list changing, while
ops_free_list() makes simple kfree(), and it can't
race with other pernet_operations callbacks.
So we may release net_mutex earlier then it was.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index e89b2b7a..f8453c4 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -522,11 +522,12 @@ static void cleanup_net(struct work_struct *work)
list_for_each_entry_reverse(ops, &pernet_list, list)
ops_exit_list(ops, &net_exit_list);
+ mutex_unlock(&net_mutex);
+
/* Free the net generic variables */
list_for_each_entry_reverse(ops, &pernet_list, list)
ops_free_list(ops, &net_exit_list);
- mutex_unlock(&net_mutex);
up_read(&net_sem);
/* Ensure there are no outstanding rcu callbacks using this