[PATCH v2 1/2] 6lowpan: Only make 6lowpan links to IEEE802154 devices

[Alan Ott]

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

Signed-off-by: Alan Ott <alan@xxxxxxxxxxx>
Suggested-by: Alexander Aring <alex.aring@xxxxxxxxx>
---
 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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