2.4.20/2.5.69 ppp_generic kmalloc()!=NULL check

@@ -2270,17 +2270,20 @@ ppp_create_interface(int unit, int *retp
 	dev->priv = ppp;
 	dev->features |= NETIF_F_DYNALLOC;
 
+	if (ret = cardmap_set(&all_ppp_units, unit, ppp))
+		goto err_unlock;
+
 	rtnl_lock();
 	ret = register_netdevice(dev);
 	rtnl_unlock();
 	if (ret != 0) {
 		printk(KERN_ERR "PPP: couldn't register device %s (%d)\n",
 		       dev->name, ret);
+		cardmap_set(&all_ppp_units, unit, NULL))
 		goto err_unlock;
 	}
 
 	atomic_inc(&ppp_unit_count);
-	cardmap_set(&all_ppp_units, unit, ppp);
 	up(&all_ppp_sem);
 	*retp = 0;
 	return ppp;

@@ -2542,6 +2545,8 @@ static void cardmap_set(struct cardmap *
 		do {
 			/* need a new top level */
 			struct cardmap *np = kmalloc(sizeof(*np), GFP_KERNEL);
+			if (np == 0)
+				return -ENOMEM;
 			memset(np, 0, sizeof(*np));
 			np->ptr[0] = p;
 			if (p != NULL) {

@@ -2557,6 +2562,8 @@ static void cardmap_set(struct cardmap *
 		i = (nr >> p->shift) & CARDMAP_MASK;
 		if (p->ptr[i] == NULL) {
 			struct cardmap *np = kmalloc(sizeof(*np), GFP_KERNEL);
+			if (np == 0)
+				return -ENOMEM;
 			memset(np, 0, sizeof(*np));
 			np->shift = p->shift - CARDMAP_ORDER;
 			np->parent = p;