[PATCH batadv] batman-adv: clean untagged VLAN on netdev registration failure

When an mesh interface is registered, it creates an untagged struct
batadv_meshif_vlan on top of it via the NETDEV_REGISTER notifier. But in
this process, another receiver of this notification can veto the
registration. The netdev registration will be aborted because of this veto.

The register_netdevice() call will try to clean up the net_device using
unregister_netdevice_queue() - which only uses the .priv_destructor to
free private resources. In this situation, .dellink will not be called.

The cleanup of the untagged batadv_meshif_vlan must thefore be done in the
destructor to avoid a leak of this object.

Fixes: 952cebb57518 ("batman-adv: add per VLAN interface attribute framework")
Signed-off-by: Sven Eckelmann <[email protected]>
---
 net/batman-adv/main.c           |  8 ++++++++
 net/batman-adv/mesh-interface.c | 13 ++-----------
 net/batman-adv/mesh-interface.h |  2 ++
 3 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 23abe04b..4cda65e4 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -267,6 +267,7 @@ int batadv_mesh_init(struct net_device *mesh_iface)
 void batadv_mesh_free(struct net_device *mesh_iface)
 {
 	struct batadv_priv *bat_priv = netdev_priv(mesh_iface);
+	struct batadv_meshif_vlan *vlan;
 
 	WRITE_ONCE(bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
 
@@ -281,6 +282,13 @@ void batadv_mesh_free(struct net_device *mesh_iface)
 
 	batadv_mcast_free(bat_priv);
 
+	/* destroy the "untagged" VLAN */
+	vlan = batadv_meshif_vlan_get(bat_priv, BATADV_NO_FLAGS);
+	if (vlan) {
+		batadv_meshif_destroy_vlan(bat_priv, vlan);
+		batadv_meshif_vlan_put(vlan);
+	}
+
 	/* Free the TT and the originator tables only after having terminated
 	 * all the other depending components which may use these structures for
 	 * their purposes.
diff --git a/net/batman-adv/mesh-interface.c b/net/batman-adv/mesh-interface.c
index a17514ea..eb4ab99d 100644
--- a/net/batman-adv/mesh-interface.c
+++ b/net/batman-adv/mesh-interface.c
@@ -633,8 +633,8 @@ int batadv_meshif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
  * @bat_priv: the bat priv with all the mesh interface information
  * @vlan: the object to remove
  */
-static void batadv_meshif_destroy_vlan(struct batadv_priv *bat_priv,
-				       struct batadv_meshif_vlan *vlan)
+void batadv_meshif_destroy_vlan(struct batadv_priv *bat_priv,
+				struct batadv_meshif_vlan *vlan)
 {
 	/* explicitly remove the associated TT local entry because it is marked
 	 * with the NOPURGE flag
@@ -1157,22 +1157,13 @@ static int batadv_meshif_newlink(struct net *src_net, struct net_device *dev,
 static void batadv_meshif_destroy_netlink(struct net_device *mesh_iface,
 					  struct list_head *head)
 {
-	struct batadv_priv *bat_priv = netdev_priv(mesh_iface);
 	struct batadv_hard_iface *hard_iface;
-	struct batadv_meshif_vlan *vlan;
 
 	while (!list_empty(&mesh_iface->adj_list.lower)) {
 		hard_iface = netdev_adjacent_get_private(mesh_iface->adj_list.lower.next);
 		batadv_hardif_disable_interface(hard_iface);
 	}
 
-	/* destroy the "untagged" VLAN */
-	vlan = batadv_meshif_vlan_get(bat_priv, BATADV_NO_FLAGS);
-	if (vlan) {
-		batadv_meshif_destroy_vlan(bat_priv, vlan);
-		batadv_meshif_vlan_put(vlan);
-	}
-
 	unregister_netdevice_queue(mesh_iface, head);
 }
 
diff --git a/net/batman-adv/mesh-interface.h b/net/batman-adv/mesh-interface.h
index 53756c5a..5e1e83e0 100644
--- a/net/batman-adv/mesh-interface.h
+++ b/net/batman-adv/mesh-interface.h
@@ -21,6 +21,8 @@ void batadv_interface_rx(struct net_device *mesh_iface,
 bool batadv_meshif_is_valid(const struct net_device *net_dev);
 extern struct rtnl_link_ops batadv_link_ops;
 int batadv_meshif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid);
+void batadv_meshif_destroy_vlan(struct batadv_priv *bat_priv,
+				struct batadv_meshif_vlan *vlan);
 void batadv_meshif_vlan_release(struct kref *ref);
 struct batadv_meshif_vlan *batadv_meshif_vlan_get(struct batadv_priv *bat_priv,
 						  unsigned short vid);

---
base-commit: 22b12d005035f37f898e5bf80480719fe1ef4fba
change-id: 20260704-vlan-destructor-daae48703190

Best regards,
--  
Sven Eckelmann <[email protected]>