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macvlan: use skb_reset_mac_header() in macvlan_queue_xmit() 

[ Upstream commit 1712b2fff8 ]

I missed the fact that macvlan_broadcast() can be used both
in RX and TX.

skb_eth_hdr() makes only sense in TX paths, so we can not
use it blindly in macvlan_broadcast()

Fixes: 96cc4b6958 ("macvlan: do not assume mac_header is set in macvlan_broadcast()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jurgen Van Ham <juvanham@gmail.com>
Tested-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2020-01-14 13:00:35 -08:00 committed by Greg Kroah-Hartman
parent 7c69f6a227
commit c17e025049
1 changed files with 3 additions and 2 deletions
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5
drivers/net/macvlan.c
View File

@ -259,7 +259,7 @@ static void macvlan_broadcast(struct sk_buff *skb,
struct net_device *src,
enum macvlan_mode mode)
{
const struct ethhdr *eth = skb_eth_hdr(skb);
const struct ethhdr *eth = eth_hdr(skb);
const struct macvlan_dev *vlan;
struct sk_buff *nskb;
unsigned int i;
@ -513,10 +513,11 @@ static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
const struct macvlan_dev *dest;
if (vlan->mode == MACVLAN_MODE_BRIDGE) {
const struct ethhdr *eth = (void *)skb->data;
const struct ethhdr *eth = skb_eth_hdr(skb);
/* send to other bridge ports directly */
if (is_multicast_ether_addr(eth->h_dest)) {
skb_reset_mac_header(skb);
macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
goto xmit_world;
}