ieee802154: lowpan_header_create check must check daddr

Packet sockets may call dev_header_parse with NULL daddr. Make lowpan_header_ops.create fail. Fixes: 87a93e4 ("ieee802154: change needed headroom/tailroom") Signed-off-by: Willem de Bruijn <[email protected]> Acked-by: Alexander Aring <[email protected]> Signed-off-by: David S. Miller <[email protected]>
modi0012 · Dec 24, 2018 · 40c3ff6 · 40c3ff6
1 parent 7bdca37
commit 40c3ff6
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/net/ieee802154/6lowpan/tx.c b/net/ieee802154/6lowpan/tx.c
@@ -48,6 +48,9 @@ int lowpan_header_create(struct sk_buff *skb, struct net_device *ldev,
 	const struct ipv6hdr *hdr = ipv6_hdr(skb);
 	struct neighbour *n;
 
+	if (!daddr)
+		return -EINVAL;
+
 	/* TODO:
 	 * if this package isn't ipv6 one, where should it be routed?
 	 */