[VLAN]: Do not access released memory.

net/8021q/vlan_dev.c

@@ -727,7 +727,6 @@ static void vlan_flush_mc_list(struct net_device *dev)
 	struct dev_mc_list *dmi = dev->mc_list;
 
 	while (dmi) {
-		dev_mc_delete(dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 		printk(KERN_DEBUG "%s: del %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address from vlan interface\n",
 		       dev->name,
 		       dmi->dmi_addr[0],
@@ -736,6 +735,7 @@ static void vlan_flush_mc_list(struct net_device *dev)
 		       dmi->dmi_addr[3],
 		       dmi->dmi_addr[4],
 		       dmi->dmi_addr[5]);
+		dev_mc_delete(dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 		dmi = dev->mc_list;
 	}