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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>
This commit is contained in:
Kirill Tkhai 2018-02-13 12:26:33 +03:00 committed by David S. Miller
parent 1a57feb847
commit bcab1ddd9b
1 changed files with 2 additions and 1 deletions
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3
net/core/net_namespace.c
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@ -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