Patch "batman-adv: Check skb size before using encapsulated ETH+VLAN header" has been added to the 4.5-stable tree

This is a note to let you know that I've just added the patch titled

batman-adv: Check skb size before using encapsulated ETH+VLAN header

to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
batman-adv-check-skb-size-before-using-encapsulated-eth-vlan-header.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Sven Eckelmann <[email protected]>
Date: Fri, 26 Feb 2016 17:56:13 +0100
Subject: batman-adv: Check skb size before using encapsulated ETH+VLAN header

From: Sven Eckelmann <[email protected]>

commit c78296665c3d81f040117432ab9e1cb125521b0c upstream.

The encapsulated ethernet and VLAN header may be outside the received ethernet frame. Thus the skb buffer size has to be checked before it can be parsed to find out if it encapsulates another batman-adv packet.

---
 net/batman-adv/soft-interface.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

@@ -407,11 +407,17 @@ void batadv_interface_rx(struct net_devi
 	 */
 	nf_reset(skb);
 
+	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
+		goto dropped;
+
 	vid = batadv_get_vid(skb, 0);
 	ethhdr = eth_hdr(skb);
 
 	switch (ntohs(ethhdr->h_proto)) {
 	case ETH_P_8021Q:
+		if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
+			goto dropped;
+
 		vhdr = (struct vlan_ethhdr *)skb->data;
 
 		if (vhdr->h_vlan_encapsulated_proto != ethertype)

@@ -423,8 +429,6 @@ void batadv_interface_rx(struct net_devi
 	}
 
 	/* skb->dev & skb->pkt_type are set here */
-	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
-		goto dropped;
 	skb->protocol = eth_type_trans(skb, soft_iface);
 
 	/* should not be necessary anymore as we use skb_pull_rcsum()

Patches currently in stable-queue which might be from [email protected] are

queue-4.5/batman-adv-reduce-refcnt-of-removed-router-when-updating-route.patch queue-4.5/batman-adv-check-skb-size-before-using-encapsulated-eth-vlan-header.patch queue-4.5/batman-adv-fix-broadcast-ogm-queue-limit-on-a-removed-interface.patch queue-4.5/batman-adv-fix-dat-candidate-selection-must-use-vid.patch