[4.2.y-ckt stable] Patch "batman-adv: fix skb deref after free" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    batman-adv: fix skb deref after free

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    https://git.launchpad.net/~canonical-kernel/linux/+git/linux-stable-ckt/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt12.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From b6a2c5823da20b343eb27d1fe55ee4492dfae98d Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw at strlen.de>
Date: Tue, 10 May 2016 23:17:59 +0200
Subject: batman-adv: fix skb deref after free

commit 63d443efe8be2c1d02b30d7e4edeb9aa085352b3 upstream.

batadv_send_skb_to_orig() calls dev_queue_xmit() so we can't use skb->len.

Fixes: 953324776d6d ("batman-adv: network coding - buffer unicast packets before forward")
Signed-off-by: Florian Westphal <fw at strlen.de>
Reviewed-by: Sven Eckelmann <sven at narfation.org>
Signed-off-by: Marek Lindner <mareklindner at neomailbox.ch>
Signed-off-by: Antonio Quartulli <a at unstable.cc>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 net/batman-adv/routing.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index cf57b20..fe25db2 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -585,6 +585,7 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 	struct batadv_unicast_packet *unicast_packet;
 	struct ethhdr *ethhdr = eth_hdr(skb);
 	int res, hdr_len, ret = NET_RX_DROP;
+	unsigned int len;

 	unicast_packet = (struct batadv_unicast_packet *)skb->data;

@@ -625,6 +626,7 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 	if (hdr_len > 0)
 		batadv_skb_set_priority(skb, hdr_len);

+	len = skb->len;
 	res = batadv_send_skb_to_orig(skb, orig_node, recv_if);

 	/* translate transmit result into receive result */
@@ -632,7 +634,7 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 		/* skb was transmitted and consumed */
 		batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
 		batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
-				   skb->len + ETH_HLEN);
+				   len + ETH_HLEN);

 		ret = NET_RX_SUCCESS;
 	} else if (res == NET_XMIT_POLICED) {
--
2.7.4