netns: do not leak net_generic data on failed init

[ Upstream commit b922934d017f1cc831b017913ed7d1a56c558b43 ]

ops_init should free the net_generic data on
init failure and __register_pernet_operations should not
call ops_free when NET_NS is not enabled.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 0b0211d..2772ed1 100644 (file)
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -82,21 +82,29 @@ assign:
 
 static int ops_init(const struct pernet_operations *ops, struct net *net)
 {
-       int err;
+       int err = -ENOMEM;
+       void *data = NULL;
+
        if (ops->id && ops->size) {
-               void *data = kzalloc(ops->size, GFP_KERNEL);
+               data = kzalloc(ops->size, GFP_KERNEL);
                if (!data)
-                       return -ENOMEM;
+                       goto out;
 
                err = net_assign_generic(net, *ops->id, data);
-               if (err) {
-                       kfree(data);
-                       return err;
-               }
+               if (err)
+                       goto cleanup;
        }
+       err = 0;
        if (ops->init)
-               return ops->init(net);
-       return 0;
+               err = ops->init(net);
+       if (!err)
+               return 0;
+
+cleanup:
+       kfree(data);
+
+out:
+       return err;
 }
 
 static void ops_free(const struct pernet_operations *ops, struct net *net)
@@ -446,12 +454,7 @@ static void __unregister_pernet_operations(struct pernet_operations *ops)
 static int __register_pernet_operations(struct list_head *list,
                                        struct pernet_operations *ops)
 {
-       int err = 0;
-       err = ops_init(ops, &init_net);
-       if (err)
-               ops_free(ops, &init_net);
-       return err;
-       
+       return ops_init(ops, &init_net);
 }
 
 static void __unregister_pernet_operations(struct pernet_operations *ops)