linux-kernel - [ 090/108] 8021q: fix mac_len recomputation in vlan

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Message-Id: <20121007225847.135259532@decadent.org.uk>
Date:	Mon, 08 Oct 2012 00:00:04 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Antonio Quartulli <ordex@...istici.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 090/108] 8021q: fix mac_len recomputation in vlan_untag()

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Antonio Quartulli <ordex@...istici.org>

[ Upstream commit 5316cf9a5197eb80b2800e1acadde287924ca975 ]

skb_reset_mac_len() relies on the value of the skb->network_header pointer,
therefore we must wait for such pointer to be recalculated before computing
the new mac_len value.

Signed-off-by: Antonio Quartulli <ordex@...istici.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/8021q/vlan_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index f5ffc02..9ddbd4e 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -106,7 +106,6 @@ static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
 		return NULL;
 	memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
 	skb->mac_header += VLAN_HLEN;
-	skb_reset_mac_len(skb);
 	return skb;
 }
 
@@ -173,6 +172,8 @@ struct sk_buff *vlan_untag(struct sk_buff *skb)
 
 	skb_reset_network_header(skb);
 	skb_reset_transport_header(skb);
+	skb_reset_mac_len(skb);
+
 	return skb;
 
 err_free:


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