8021q: fix mac_len recomputation in vlan_untag()

[ 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@autistici.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index f5ffc02..9ddbd4e 100644 (file)
--- 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: