[IPV4]: ip_rt_ioctl argument is user pointer.

The function ip_rt_ioctl expects a pointer to a user route structure, so define
it that way and cast as appropriate.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@redhat.com>

include/net/route.h

@@ -129,7 +129,7 @@ extern void		ip_rt_send_redirect(struct sk_buff *skb);
 
 extern unsigned		inet_addr_type(u32 addr);
 extern void		ip_rt_multicast_event(struct in_device *);
-extern int		ip_rt_ioctl(unsigned int cmd, void *arg);
+extern int		ip_rt_ioctl(unsigned int cmd, void __user *arg);
 extern void		ip_rt_get_source(u8 *src, struct rtable *rt);
 extern int		ip_rt_dump(struct sk_buff *skb,  struct netlink_callback *cb);
 

net/ipv4/af_inet.c

@@ -848,7 +848,7 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		case SIOCADDRT:
 		case SIOCDELRT:
 		case SIOCRTMSG:
-			err = ip_rt_ioctl(cmd, (void *)arg);
+			err = ip_rt_ioctl(cmd, (void __user *)arg);
 			break;
 		case SIOCDARP:
 		case SIOCGARP:

net/ipv4/fib_frontend.c

@@ -235,7 +235,7 @@ int fib_validate_source(u32 src, u32 dst, u8 tos, int oif,
  *	Handle IP routing ioctl calls. These are used to manipulate the routing tables
  */
  
-int ip_rt_ioctl(unsigned int cmd, void *arg)
+int ip_rt_ioctl(unsigned int cmd, void __user *arg)
 {
 	int err;
 	struct kern_rta rta;

net/ipv4/ipconfig.c

@@ -272,7 +272,7 @@ static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 
 	mm_segment_t oldfs = get_fs();
 	set_fs(get_ds());
-	res = devinet_ioctl(cmd, arg);
+	res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
 	set_fs(oldfs);
 	return res;
 }
@@ -283,7 +283,7 @@ static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 
 	mm_segment_t oldfs = get_fs();
 	set_fs(get_ds());
-	res = ip_rt_ioctl(cmd, arg);
+	res = ip_rt_ioctl(cmd, (void __user *) arg);
 	set_fs(oldfs);
 	return res;
 }