[PATCH v2 02/31] net: Cleanup copy_net_ns()

From: Kirill Tkhai
Date: Mon Nov 20 2017 - 13:32:43 EST


Line up destructors actions in the revers order
to constructors. Next patches will add more actions,
and this will be comfortable, if there is the such
order.

Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
---
net/core/net_namespace.c | 20 +++++++++-----------
1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 7ecf71050ffa..2e512965bf42 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -404,27 +404,25 @@ struct net *copy_net_ns(unsigned long flags,

net = net_alloc();
if (!net) {
- dec_net_namespaces(ucounts);
- return ERR_PTR(-ENOMEM);
+ rv = -ENOMEM;
+ goto dec_ucounts;
}
-
+ refcount_set(&net->passive, 1);
+ net->ucounts = ucounts;
get_user_ns(user_ns);

rv = mutex_lock_killable(&net_mutex);
- if (rv < 0) {
- net_free(net);
- dec_net_namespaces(ucounts);
- put_user_ns(user_ns);
- return ERR_PTR(rv);
- }
+ if (rv < 0)
+ goto put_userns;

- net->ucounts = ucounts;
rv = setup_net(net, user_ns);
mutex_unlock(&net_mutex);
if (rv < 0) {
- dec_net_namespaces(ucounts);
+put_userns:
put_user_ns(user_ns);
net_drop_ns(net);
+dec_ucounts:
+ dec_net_namespaces(ucounts);
return ERR_PTR(rv);
}
return net;