1 files changed, 27 insertions, 18 deletions

diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index 2acd7a666bda..65f39530799d 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -127,7 +127,7 @@ void gw_election(struct bat_priv *bat_priv)
 		return;
 
 	curr_gw = gw_get_selected_gw_node(bat_priv);
-	if (!curr_gw)
+	if (curr_gw)
 		goto out;
 
 	rcu_read_lock();
@@ -310,9 +310,13 @@ void gw_node_update(struct bat_priv *bat_priv,
 	struct hlist_node *node;
 	struct gw_node *gw_node, *curr_gw;
 
+	/**
+	 * Note: We don't need a NULL check here, since curr_gw never gets
+	 * dereferenced. If curr_gw is NULL we also should not exit as we may
+	 * have this gateway in our list (duplication check!) even though we
+	 * have no currently selected gateway.
+	 */
 	curr_gw = gw_get_selected_gw_node(bat_priv);
-	if (!curr_gw)
-		goto out;
 
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
@@ -350,7 +354,7 @@ deselect:
 	gw_deselect(bat_priv);
 unlock:
 	rcu_read_unlock();
-out:
+
 	if (curr_gw)
 		gw_node_free_ref(curr_gw);
 }
@@ -435,30 +439,32 @@ int gw_client_seq_print_text(struct seq_file *seq, void *offset)
 {
 	struct net_device *net_dev = (struct net_device *)seq->private;
 	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	struct hard_iface *primary_if;
 	struct gw_node *gw_node;
 	struct hlist_node *node;
-	int gw_count = 0;
+	int gw_count = 0, ret = 0;
 
-	if (!bat_priv->primary_if) {
-
-		return seq_printf(seq, "BATMAN mesh %s disabled - please "
-				  "specify interfaces to enable it\n",
-				  net_dev->name);
+	primary_if = primary_if_get_selected(bat_priv);
+	if (!primary_if) {
+		ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
+				 "specify interfaces to enable it\n",
+				 net_dev->name);
+		goto out;
 	}
 
-	if (bat_priv->primary_if->if_status != IF_ACTIVE) {
-
-		return seq_printf(seq, "BATMAN mesh %s disabled - "
-				       "primary interface not active\n",
-				       net_dev->name);
+	if (primary_if->if_status != IF_ACTIVE) {
+		ret = seq_printf(seq, "BATMAN mesh %s disabled - "
+				 "primary interface not active\n",
+				 net_dev->name);
+		goto out;
 	}
 
 	seq_printf(seq, "      %-12s (%s/%i) %17s [%10s]: gw_class ... "
 		   "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
 		   "Gateway", "#", TQ_MAX_VALUE, "Nexthop",
 		   "outgoingIF", SOURCE_VERSION, REVISION_VERSION_STR,
-		   bat_priv->primary_if->net_dev->name,
-		   bat_priv->primary_if->net_dev->dev_addr, net_dev->name);
+		   primary_if->net_dev->name,
+		   primary_if->net_dev->dev_addr, net_dev->name);
 
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
@@ -476,7 +482,10 @@ int gw_client_seq_print_text(struct seq_file *seq, void *offset)
 	if (gw_count == 0)
 		seq_printf(seq, "No gateways in range ...\n");
 
-	return 0;
+out:
+	if (primary_if)
+		hardif_free_ref(primary_if);
+	return ret;
 }
 
 int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)