From: Willem de Bruijn <willemb@google.com>
Date: Sun, 23 Dec 2018 17:52:18 +0000 (-0500)
Subject: ieee802154: lowpan_header_create check must check daddr
X-Git-Tag: v4.9.149~61
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1a6cd598c82744db1cfd8524af977b4d4701a569;p=platform%2Fkernel%2Flinux-amlogic.git

ieee802154: lowpan_header_create check must check daddr

[ Upstream commit 40c3ff6d5e0809505a067dd423c110c5658c478c ]

Packet sockets may call dev_header_parse with NULL daddr. Make
lowpan_header_ops.create fail.

Fixes: 87a93e4eceb4 ("ieee802154: change needed headroom/tailroom")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/ieee802154/6lowpan/tx.c b/net/ieee802154/6lowpan/tx.c
index 50ed47559bb7..34d20a2a5cbd 100644
--- 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?
 	 */