net: Zero terminate ifr_name in dev_ifname().

The ifr.ifr_name is passed around and assumed to be NULL terminated. Signed-off-by: David S. Miller <davem@davemloft.net>
emutex · Jul 19, 2017 · 6367911 · 6367911
1 parent 98de4e0
commit 6367911
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
@@ -28,6 +28,7 @@ static int dev_ifname(struct net *net, struct ifreq __user *arg)
 
 	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
 		return -EFAULT;
+	ifr.ifr_name[IFNAMSIZ-1] = 0;
 
 	error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
 	if (error)