From f654861569872d10dcb79d9d7ca219b316f94ff0 Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Mon, 14 Dec 2015 17:44:10 -0500 Subject: [PATCH] skbuff: Fix offset error in skb_reorder_vlan_header 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 CC: Patrick McHardy Signed-off-by: Vladislav Yasevich Signed-off-by: David S. Miller --- 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 152b9c70e252..5cc43d37a4a2 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4268,7 +4268,7 @@ 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;