netdev - [PATCH 2.6.36/stable v2] vlan: Fix crash when hwaccel rx pkt for non-existant vlan.

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Message-Id: <1288112797-21550-1-git-send-email-greearb@candelatech.com>
Date:	Tue, 26 Oct 2010 10:06:37 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	netdev@...r.kernel.org
Cc:	Ben Greear <greearb@...delatech.com>
Subject: [PATCH 2.6.36/stable v2] vlan:  Fix crash when hwaccel rx pkt for non-existant vlan.

The vlan_hwaccel_do_receive code expected skb->dev to always
be a vlan device, but if the NIC was promisc, and the VLAN
for a particular VID was not configured, then this method
could receive a packet where skb->dev was NOT a vlan
device.  This caused access of bad memory and a crash.

Signed-off-by: Ben Greear <greearb@...delatech.com>
---
v1 -> v2:  Simplify patch..no need for setting pkt-type, etc.

:100644 100644 0eb96f7... 0687b6c... M	net/8021q/vlan_core.c
:100644 100644 660dd41... 5dc45b9... M	net/core/dev.c
 net/8021q/vlan_core.c |    3 +++
 net/core/dev.c        |    5 +++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 0eb96f7..0687b6c 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -43,6 +43,9 @@ int vlan_hwaccel_do_receive(struct sk_buff *skb)
 	struct net_device *dev = skb->dev;
 	struct vlan_rx_stats     *rx_stats;
 
+	if (!is_vlan_dev(dev))
+		return 0;
+
 	skb->dev = vlan_dev_info(dev)->real_dev;
 	netif_nit_deliver(skb);
 
diff --git a/net/core/dev.c b/net/core/dev.c
index 660dd41..5dc45b9 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2828,8 +2828,9 @@ static int __netif_receive_skb(struct sk_buff *skb)
 	if (!netdev_tstamp_prequeue)
 		net_timestamp_check(skb);
 
-	if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
-		return NET_RX_SUCCESS;
+	if (vlan_tx_tag_present(skb))
+		/* This method cannot fail at this time. */
+		vlan_hwaccel_do_receive(skb);
 
 	/* if we've gotten here through NAPI, check netpoll */
 	if (netpoll_receive_skb(skb))
-- 
1.6.2.5

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