1 files changed, 12 insertions, 16 deletions

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index ce6396a75b8b..e7345d9031df 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -198,8 +198,10 @@ static int __peernet2id(struct net *net, struct net *peer, bool alloc)
  */
 int peernet2id(struct net *net, struct net *peer)
 {
-	int id = __peernet2id(net, peer, true);
+	bool alloc = atomic_read(&peer->count) == 0 ? false : true;
+	int id;
 
+	id = __peernet2id(net, peer, alloc);
 	return id >= 0 ? id : NETNSA_NSID_NOT_ASSIGNED;
 }
 EXPORT_SYMBOL(peernet2id);
@@ -338,7 +340,7 @@ static LIST_HEAD(cleanup_list);  /* Must hold cleanup_list_lock to touch */
 static void cleanup_net(struct work_struct *work)
 {
 	const struct pernet_operations *ops;
-	struct net *net, *tmp, *peer;
+	struct net *net, *tmp;
 	struct list_head net_kill_list;
 	LIST_HEAD(net_exit_list);
 
@@ -354,6 +356,14 @@ static void cleanup_net(struct work_struct *work)
 	list_for_each_entry(net, &net_kill_list, cleanup_list) {
 		list_del_rcu(&net->list);
 		list_add_tail(&net->exit_list, &net_exit_list);
+		for_each_net(tmp) {
+			int id = __peernet2id(tmp, net, false);
+
+			if (id >= 0)
+				idr_remove(&tmp->netns_ids, id);
+		}
+		idr_destroy(&net->netns_ids);
+
 	}
 	rtnl_unlock();
 
@@ -379,26 +389,12 @@ static void cleanup_net(struct work_struct *work)
 	 */
 	rcu_barrier();
 
-	rtnl_lock();
 	/* Finally it is safe to free my network namespace structure */
 	list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {
-		/* Unreference net from all peers (no need to loop over
-		 * net_exit_list because idr_destroy() will be called for each
-		 * element of this list.
-		 */
-		for_each_net(peer) {
-			int id = __peernet2id(peer, net, false);
-
-			if (id >= 0)
-				idr_remove(&peer->netns_ids, id);
-		}
-		idr_destroy(&net->netns_ids);
-
 		list_del_init(&net->exit_list);
 		put_user_ns(net->user_ns);
 		net_drop_ns(net);
 	}
-	rtnl_unlock();
 }
 static DECLARE_WORK(net_cleanup_work, cleanup_net);