[VLAN]: Fix egress priority mappings leak.

These entries are allocated in vlan_dev_set_egress_priority, 
but are never released and leaks on vlan device removal.

Drop these in vlan's ->uninit callback - after the device is 
brought down and everyone is notified about it is going to
be unregistered.

Found during testing vlan netnsization patchset.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 480ea90e7dcd..41a76a05e6fd 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -692,6 +692,20 @@ static int vlan_dev_init(struct net_device *dev)
         return 0;
 }
 
+static void vlan_dev_uninit(struct net_device *dev)
+{
+        struct vlan_priority_tci_mapping *pm;
+        struct vlan_dev_info *vlan = vlan_dev_info(dev);
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
+                while ((pm = vlan->egress_priority_map[i]) != NULL) {
+                        vlan->egress_priority_map[i] = pm->next;
+                        kfree(pm);
+                }
+        }
+}
+
 void vlan_setup(struct net_device *dev)
 {
         ether_setup(dev);
@@ -701,6 +715,7 @@ void vlan_setup(struct net_device *dev)
 
         dev->change_mtu         = vlan_dev_change_mtu;
         dev->init               = vlan_dev_init;
+        dev->uninit             = vlan_dev_uninit;
         dev->open               = vlan_dev_open;
         dev->stop               = vlan_dev_stop;
         dev->set_mac_address    = vlan_dev_set_mac_address;