[PATCH 4.9 42/93] net: Zero terminate ifr_name in dev_ifname().

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "David S. Miller" <da...@davemloft.net>


[ Upstream commit 63679112c536289826fec61c917621de95ba2ade ]

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

Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/core/dev_ioctl.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -28,6 +28,7 @@ static int dev_ifname(struct net *net, s
 
        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)