linux-kernel - [PATCH 4.1 29/43] skbuff: Fix offset error in skb_reorder_vlan

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Message-Id: <20160120215931.213733930@linuxfoundation.org>
Date:	Wed, 20 Jan 2016 15:10:36 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Patrick McHardy <kaber@...sh.net>,
	Vladislav Yasevich <vyasevich@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.1 29/43] skbuff: Fix offset error in skb_reorder_vlan_header

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

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

From: Vlad Yasevich <vyasevich@...il.com>

[ Upstream commit f654861569872d10dcb79d9d7ca219b316f94ff0 ]

skb_reorder_vlan_header is called after the vlan header has
been pulled.  As a result the offset of the begining of
the mac header has been incrased by 4 bytes (VLAN_HLEN).
When moving the mac addresses, include this incrase in
the offset calcualation so that the mac addresses are
copied correctly.

Fixes: a6e18ff1117 (vlan: Fix untag operations of stacked vlans with REORDER_HEADER off)
CC: Nicolas Dichtel <nicolas.dichtel@...nd.com>
CC: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Vladislav Yasevich <vyasevich@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/skbuff.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4200,7 +4200,7 @@ static struct sk_buff *skb_reorder_vlan_
 		return NULL;
 	}
 
-	memmove(skb->data - ETH_HLEN, skb->data - skb->mac_len,
+	memmove(skb->data - ETH_HLEN, skb->data - skb->mac_len - VLAN_HLEN,
 		2 * ETH_ALEN);
 	skb->mac_header += VLAN_HLEN;
 	return skb;