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

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

From: Eric Dumazet <eduma...@google.com>


[ Upstream commit db7a65e3ab78e5b1c4b17c0870ebee35a4ee3257 ]

Use valid_name() to make sure user does not provide illegal
device name.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <eduma...@google.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv6/ip6_tunnel.c |   11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -297,13 +297,16 @@ static struct ip6_tnl *ip6_tnl_create(st
        struct net_device *dev;
        struct ip6_tnl *t;
        char name[IFNAMSIZ];
-       int err = -ENOMEM;
+       int err = -E2BIG;
 
-       if (p->name[0])
+       if (p->name[0]) {
+               if (!dev_valid_name(p->name))
+                       goto failed;
                strlcpy(name, p->name, IFNAMSIZ);
-       else
+       } else {
                sprintf(name, "ip6tnl%%d");
-
+       }
+       err = -ENOMEM;
        dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
                           ip6_tnl_dev_setup);
        if (!dev)


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