From: Alexander Aring <alex.aring@gmail.com>
Date: Wed, 2 Sep 2015 12:21:23 +0000 (+0200)
Subject: ieee802154: 6lowpan: trivial checks at first
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=742c3afe53c5d16fa62632c34f8e2273766d3052;p=openwrt%2Fstaging%2Fblogic.git

ieee802154: 6lowpan: trivial checks at first

This patch moves some trivial checks at first before calling
skb_share_check which could do some memcpy if the buffer is shared.

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>
---

diff --git a/net/ieee802154/6lowpan/rx.c b/net/ieee802154/6lowpan/rx.c
index 4ddf69445032..74d8fec51a0c 100644
--- a/net/ieee802154/6lowpan/rx.c
+++ b/net/ieee802154/6lowpan/rx.c
@@ -63,7 +63,8 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *wdev,
 	struct net_device *ldev;
 	int ret;
 
-	if (wdev->type != ARPHRD_IEEE802154)
+	if (wdev->type != ARPHRD_IEEE802154 ||
+	    skb->pkt_type == PACKET_OTHERHOST)
 		goto drop;
 
 	ldev = wdev->ieee802154_ptr->lowpan_dev;
@@ -74,9 +75,6 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *wdev,
 	if (!skb)
 		goto drop;
 
-	if (skb->pkt_type == PACKET_OTHERHOST)
-		goto drop_skb;
-
 	if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
 		goto drop_skb;