s390/qeth: fix L2 header access in qeth_l3_osa_features_check()

[ Upstream commit f9c4845385c8f6631ebd5dddfb019ea7a285fba4 ]

ip_finish_output_gso() may call .ndo_features_check() even before the
skb has a L2 header. This conflicts with qeth_get_ip_version()'s attempt
to inspect the L2 header via vlan_eth_hdr().

Switch to vlan_get_protocol(), as already used further down in the
common qeth_features_check() path.

Fixes: f13ade199391 ("s390/qeth: run non-offload L3 traffic over common xmit path")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 2cd6f19..291861c 100644 (file)
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1816,7 +1816,7 @@ static netdev_features_t qeth_l3_osa_features_check(struct sk_buff *skb,
                                                    struct net_device *dev,
                                                    netdev_features_t features)
 {
-       if (qeth_get_ip_version(skb) != 4)
+       if (vlan_get_protocol(skb) != htons(ETH_P_IP))
                features &= ~NETIF_F_HW_VLAN_CTAG_TX;
        return qeth_features_check(skb, dev, features);
 }