[PATCH v2 04/31] net: Move mutex_unlock() in cleanup_net() up
From: Kirill Tkhai <hidden>
Date: 2017-11-20 18:32:59
Also in:
lkml
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> --- net/core/net_namespace.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 859dce31e37e..c4f7452906bb 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c@@ -489,11 +489,12 @@ 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