wan: Missing capability checks in sbni_ioctl()

There are missing capability checks in the following code:

1300 static int
1301 sbni_ioctl( struct net_device  *dev,  struct ifreq  *ifr,  int  cmd)
1302 {
[...]
1319     case  SIOCDEVRESINSTATS :
1320         if( current->euid != 0 )    /* root only */
1321             return  -EPERM;
[...]
1336     case  SIOCDEVSHWSTATE :
1337         if( current->euid != 0 )    /* root only */
1338             return  -EPERM;
[...]
1357     case  SIOCDEVENSLAVE :
1358         if( current->euid != 0 )    /* root only */
1359             return  -EPERM;
[...]
1372     case  SIOCDEVEMANSIPATE :
1373         if( current->euid != 0 )    /* root only */
1374             return  -EPERM;

Here's my proposed fix:

Missing capability checks.
Signed-off-by: NEugene Teo <eugeneteo@kernel.sg>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/wan/sbni.c

@@ -1317,7 +1317,7 @@ sbni_ioctl( struct net_device  *dev,  struct ifreq  *ifr,  int  cmd )
 		break;
 
 	case  SIOCDEVRESINSTATS :
-		if( current->euid != 0 )	/* root only */
+		if (!capable(CAP_NET_ADMIN))
 			return  -EPERM;
 		memset( &nl->in_stats, 0, sizeof(struct sbni_in_stats) );
 		break;
@@ -1334,7 +1334,7 @@ sbni_ioctl( struct net_device  *dev,  struct ifreq  *ifr,  int  cmd )
 		break;
 
 	case  SIOCDEVSHWSTATE :
-		if( current->euid != 0 )	/* root only */
+		if (!capable(CAP_NET_ADMIN))
 			return  -EPERM;
 
 		spin_lock( &nl->lock );
@@ -1355,7 +1355,7 @@ sbni_ioctl( struct net_device  *dev,  struct ifreq  *ifr,  int  cmd )
 #ifdef CONFIG_SBNI_MULTILINE
 
 	case  SIOCDEVENSLAVE :
-		if( current->euid != 0 )	/* root only */
+		if (!capable(CAP_NET_ADMIN))
 			return  -EPERM;
 
 		if (copy_from_user( slave_name, ifr->ifr_data, sizeof slave_name ))
@@ -1370,7 +1370,7 @@ sbni_ioctl( struct net_device  *dev,  struct ifreq  *ifr,  int  cmd )
 		return  enslave( dev, slave_dev );
 
 	case  SIOCDEVEMANSIPATE :
-		if( current->euid != 0 )	/* root only */
+		if (!capable(CAP_NET_ADMIN))
 			return  -EPERM;
 
 		return  emancipate( dev );