net: Zero terminate ifr_name in dev_ifname().

[ Upstream commit 63679112c536289826fec61c917621de95ba2ade ]

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

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index b94b1d2..151e047 100644 (file)
--- 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)