6lowpan: Only make 6lowpan links to IEEE802154 devices

Refuse to create 6lowpan links if the actual hardware interface is
of any type other than ARPHRD_IEEE802154.

Signed-off-by: Alan Ott <alan@signal11.us>
Suggested-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index c85e71e0c7ff..8f56b2b63bfb 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -1372,6 +1372,8 @@ static int lowpan_newlink(struct net *src_net, struct net_device *dev,
         real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
         if (!real_dev)
                 return -ENODEV;
+        if (real_dev->type != ARPHRD_IEEE802154)
+                return -EINVAL;
 
         lowpan_dev_info(dev)->real_dev = real_dev;
         lowpan_dev_info(dev)->fragment_tag = 0;