[AX.25]: Fix unchecked rose_add_loopback_neigh uses

rose_add_loopback_neigh uses kmalloc and the callers were ignoring the
error value.  Rewrite to let the caller deal with the allocation.  This
allows the use of static allocation of kmalloc use entirely.

Signed-off-by: Ralf Baechle <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

include/net/rose.h

@@ -188,12 +188,12 @@ extern void rose_kick(struct sock *);
 extern void rose_enquiry_response(struct sock *);
 
 /* rose_route.c */
-extern struct rose_neigh *rose_loopback_neigh;
+extern struct rose_neigh rose_loopback_neigh;
 extern struct file_operations rose_neigh_fops;
 extern struct file_operations rose_nodes_fops;
 extern struct file_operations rose_routes_fops;
 
-extern int __must_check rose_add_loopback_neigh(void);
+extern void rose_add_loopback_neigh(void);
 extern int __must_check rose_add_loopback_node(rose_address *);
 extern void rose_del_loopback_node(rose_address *);
 extern void rose_rt_device_down(struct net_device *);

net/rose/rose_loopback.c

@@ -79,15 +79,16 @@ static void rose_loopback_timer(unsigned long param)
 
 		skb->h.raw = skb->data;
 
-		if ((sk = rose_find_socket(lci_o, rose_loopback_neigh)) != NULL) {
+		sk = rose_find_socket(lci_o, &rose_loopback_neigh);
+		if (sk) {
 			if (rose_process_rx_frame(sk, skb) == 0)
 				kfree_skb(skb);
 			continue;
 		}
 
 		if (frametype == ROSE_CALL_REQUEST) {
 			if ((dev = rose_dev_get(dest)) != NULL) {
-				if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0)
+				if (rose_rx_call_request(skb, dev, &rose_loopback_neigh, lci_o) == 0)
 					kfree_skb(skb);
 			} else {
 				kfree_skb(skb);

net/rose/rose_route.c

@@ -46,7 +46,7 @@ static DEFINE_SPINLOCK(rose_neigh_list_lock);
 static struct rose_route *rose_route_list;
 static DEFINE_SPINLOCK(rose_route_list_lock);
 
-struct rose_neigh *rose_loopback_neigh;
+struct rose_neigh rose_loopback_neigh;
 
 /*
  *	Add a new route to a node, and in the process add the node and the
@@ -361,33 +361,30 @@ static int rose_del_node(struct rose_route_struct *rose_route,
 /*
  *	Add the loopback neighbour.
  */
-int rose_add_loopback_neigh(void)
+void rose_add_loopback_neigh(void)
 {
-	if ((rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_ATOMIC)) == NULL)
-		return -ENOMEM;
+	struct rose_neigh *sn = &rose_loopback_neigh;
 
-	rose_loopback_neigh->callsign  = null_ax25_address;
-	rose_loopback_neigh->digipeat  = NULL;
-	rose_loopback_neigh->ax25      = NULL;
-	rose_loopback_neigh->dev       = NULL;
-	rose_loopback_neigh->count     = 0;
-	rose_loopback_neigh->use       = 0;
-	rose_loopback_neigh->dce_mode  = 1;
-	rose_loopback_neigh->loopback  = 1;
-	rose_loopback_neigh->number    = rose_neigh_no++;
-	rose_loopback_neigh->restarted = 1;
+	sn->callsign  = null_ax25_address;
+	sn->digipeat  = NULL;
+	sn->ax25      = NULL;
+	sn->dev       = NULL;
+	sn->count     = 0;
+	sn->use       = 0;
+	sn->dce_mode  = 1;
+	sn->loopback  = 1;
+	sn->number    = rose_neigh_no++;
+	sn->restarted = 1;
 
-	skb_queue_head_init(&rose_loopback_neigh->queue);
+	skb_queue_head_init(&sn->queue);
 
-	init_timer(&rose_loopback_neigh->ftimer);
-	init_timer(&rose_loopback_neigh->t0timer);
+	init_timer(&sn->ftimer);
+	init_timer(&sn->t0timer);
 
 	spin_lock_bh(&rose_neigh_list_lock);
-	rose_loopback_neigh->next = rose_neigh_list;
-	rose_neigh_list           = rose_loopback_neigh;
+	sn->next = rose_neigh_list;
+	rose_neigh_list           = sn;
 	spin_unlock_bh(&rose_neigh_list_lock);
-
-	return 0;
 }
 
 /*
@@ -421,13 +418,13 @@ int rose_add_loopback_node(rose_address *address)
 	rose_node->mask         = 10;
 	rose_node->count        = 1;
 	rose_node->loopback     = 1;
-	rose_node->neighbour[0] = rose_loopback_neigh;
+	rose_node->neighbour[0] = &rose_loopback_neigh;
 
 	/* Insert at the head of list. Address is always mask=10 */
 	rose_node->next = rose_node_list;
 	rose_node_list  = rose_node;
 
-	rose_loopback_neigh->count++;
+	rose_loopback_neigh.count++;
 
 out:
 	spin_unlock_bh(&rose_node_list_lock);
@@ -458,7 +455,7 @@ void rose_del_loopback_node(rose_address *address)
 
 	rose_remove_node(rose_node);
 
-	rose_loopback_neigh->count--;
+	rose_loopback_neigh.count--;
 
 out:
 	spin_unlock_bh(&rose_node_list_lock);