Subject: [PATCH 10/45] net: Zero terminate ifr_name in dev_ifname().

From: "David S. Miller" <[email-masked]>
Date: Wed, 19 Jul 2017 13:33:24 -0700

[ Upstream commit 63679112c536289826fec61c917621de95ba2ade ]

The ifr.ifr_name is passed around and assumed to be NULL terminated.

Signed-off-by: David S. Miller <[email-masked]>
---
 net/core/dev_ioctl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index 434413f1074a..18f9cb9aa87d 100644
--- 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)
-- 
2.13.4