Fix the VLAN_TAG_PRESENT in netvsc_recv_callback()

We should call __vlan_hwaccel_put_tag() only if the packet
comes from vlan, otherwise VLAN_TAG_PRESENT will always be
added.

Reported-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index ab2307b..4dccead 100644 (file)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -285,7 +285,9 @@ int netvsc_recv_callback(struct hv_device *device_obj,
 
        skb->protocol = eth_type_trans(skb, net);
        skb->ip_summed = CHECKSUM_NONE;
-       __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), packet->vlan_tci);
+       if (packet->vlan_tci & VLAN_TAG_PRESENT)
+               __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
+                                      packet->vlan_tci);
 
        net->stats.rx_packets++;
        net->stats.rx_bytes += packet->total_data_buflen;