From 54552d03023cfd485cedf8d7471d1554139d58aa Mon Sep 17 00:00:00 2001
From: Alexander Aring <alex.aring@gmail.com>
Date: Wed, 2 Sep 2015 14:21:29 +0200
Subject: ieee802154: 6lowpan: check on valid 802.15.4 frame

This patch adds frame control checks to check if the received frame is
something which could contain a 6LoWPAN packet.

Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
---
 net/ieee802154/6lowpan/rx.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'net/ieee802154')

diff --git a/net/ieee802154/6lowpan/rx.c b/net/ieee802154/6lowpan/rx.c
index 45ce121..f7eb091 100644
--- a/net/ieee802154/6lowpan/rx.c
+++ b/net/ieee802154/6lowpan/rx.c
@@ -11,6 +11,7 @@
 #include <linux/if_arp.h>
 
 #include <net/6lowpan.h>
+#include <net/mac802154.h>
 #include <net/ieee802154_netdev.h>
 
 #include "6lowpan_i.h"
@@ -280,6 +281,13 @@ static inline bool lowpan_is_reserved(u8 dispatch)
  */
 static inline bool lowpan_rx_h_check(struct sk_buff *skb)
 {
+	__le16 fc = ieee802154_get_fc_from_skb(skb);
+
+	/* check on ieee802154 conform 6LoWPAN header */
+	if (!ieee802154_is_data(fc) ||
+	    !ieee802154_is_intra_pan(fc))
+		return false;
+
 	/* check if we can dereference the dispatch */
 	if (unlikely(!skb->len))
 		return false;
-- 
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