| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 81/97] macvlan: use skb_reset_mac_header() in macvlan_queue_xmit() | Date | Wed, 22 Jan 2020 10:29:25 +0100 |
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From: Eric Dumazet <edumazet@google.com>
[ Upstream commit 1712b2fff8c682d145c7889d2290696647d82dab ]
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: 96cc4b69581d ("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> --- drivers/net/macvlan.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -234,7 +234,7 @@ static void macvlan_broadcast(struct sk_ 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; @@ -487,10 +487,11 @@ static int macvlan_queue_xmit(struct sk_ 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; }
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