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

Signed-off-by: Alan Ott <a...@signal11.us>
Suggested-by: Alexander Aring <alex.ar...@gmail.com>
---
 net/ieee802154/6lowpan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index c85e71e..8f56b2b 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;
-- 
1.8.1.2


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