From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 25 Jan 2010 03:52:24 +0000 (-0800)
Subject: vlan: fix vlan_skb_recv()
X-Git-Tag: MMI-PSA29.97-13-9~24944^2~60
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2dc85e91d05be91343033df78e4e6d99dc7ea50e;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

vlan: fix vlan_skb_recv()

Bruno Prémont found commit 9793241fe92f7d930
(vlan: Precise RX stats accounting) added a regression for non
hw accelerated vlans.

[   26.390576] BUG: unable to handle kernel NULL pointer dereference at (null)
[   26.396369] IP: [<df856b89>] vlan_skb_recv+0x89/0x280 [8021q]

vlan_dev_info() was used with original device, instead of
skb->dev. Also spotted by Américo Wang.

Reported-By: Bruno Prémont <bonbons@linux-vserver.org>
Tested-By: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index b7889782047e..c1b92cab46c7 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -163,7 +163,7 @@ int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 		goto err_unlock;
 	}
 
-	rx_stats = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats,
+	rx_stats = per_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats,
 			       smp_processor_id());
 	rx_stats->rx_packets++;
 	rx_stats->rx_bytes += skb->len;