linux-kernel - [PATCH 3.12 75/91] skbuff: Fix offset error in skb_reorder_vlan

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Message-Id: <15c057e4548f1c655d21eb22fc52f7d62dff5c9f.1452015822.git.jslaby@suse.cz>
Date:	Tue,  5 Jan 2016 18:46:59 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Vlad Yasevich <vyasevich@...il.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Patrick McHardy <kaber@...sh.net>,
	"David S . Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 75/91] skbuff: Fix offset error in skb_reorder_vlan_header

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

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

===============

[ 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: Jiri Slaby <jslaby@...e.cz>
---
 net/core/skbuff.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index be70fe425542..56cdf3bb1e7f 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3583,7 +3583,7 @@ static struct sk_buff *skb_reorder_vlan_header(struct sk_buff *skb)
 		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;
-- 
2.6.4

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