[NET]: Fix crash in dev_mc_sync()/dev_mc_unsync()

This patch fixes a crash that may occur when the routine dev_mc_sync()
deletes an address from the list it is currently going through. It
saves the pointer to the next element before deleting the current one.
The problem may also exist in dev_mc_unsync().

Signed-off-by: Benjamin Thery <[e-mail]>
Acked-by: Patrick McHardy <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/core/dev_mcast.c

···
  */
 int dev_mc_sync(struct net_device *to, struct net_device *from)
 {
-	struct dev_addr_list *da;
+	struct dev_addr_list *da, *next;
 	int err = 0;
 
 	netif_tx_lock_bh(to);
-	for (da = from->mc_list; da != NULL; da = da->next) {
+	da = from->mc_list;
+	while (da != NULL) {
+		next = da->next;
 		if (!da->da_synced) {
 			err = __dev_addr_add(&to->mc_list, &to->mc_count,
 					     da->da_addr, da->da_addrlen, 0);
···
 			__dev_addr_delete(&from->mc_list, &from->mc_count,
 					  da->da_addr, da->da_addrlen, 0);
 		}
+		da = next;
 	}
 	if (!err)
 		__dev_set_rx_mode(to);
···
  */
 void dev_mc_unsync(struct net_device *to, struct net_device *from)
 {
-	struct dev_addr_list *da;
+	struct dev_addr_list *da, *next;
 
 	netif_tx_lock_bh(from);
 	netif_tx_lock_bh(to);
 
-	for (da = from->mc_list; da != NULL; da = da->next) {
+	da = from->mc_list;
+	while (da != NULL) {
+		next = da->next;
 		if (!da->da_synced)
 			continue;
 		__dev_addr_delete(&to->mc_list, &to->mc_count,
···
 		da->da_synced = 0;
 		__dev_addr_delete(&from->mc_list, &from->mc_count,
 				  da->da_addr, da->da_addrlen, 0);
+		da = next;
 	}
 	__dev_set_rx_mode(to);