From: Willem de Bruijn <willemb@google.com>
Date: Sun, 23 Dec 2018 12:52:18 -0500
Subject: ieee802154: lowpan_header_create check must check daddr
Git-commit: 40c3ff6d5e0809505a067dd423c110c5658c478c
Patch-mainline: v5.0-rc1
References: networking-stable-19_01_04
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: Jiri Slaby <jslaby@suse.cz>
---
net/ieee802154/6lowpan/tx.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/ieee802154/6lowpan/tx.c b/net/ieee802154/6lowpan/tx.c
index ca53efa17be1..8bec827081cd 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?
*/
--
2.20.1