iavf: check for null in iavf_fix_features

[ Upstream commit 8a4a126f4be88eb8b5f00a165ab58c35edf4ef76 ]

If the driver has lost contact with the PF then it enters a disabled state
and frees adapter->vf_res. However, ndo_fix_features can still be called on
the interface, so we need to check for this condition first. Since we have
no information on the features at this time simply leave them unmodified
and return.

Fixes: c4445aedfe09 ("i40evf: Fix VLAN features")
Signed-off-by: Nicholas Nunley <nicholas.d.nunley@intel.com>
Tested-by: Tony Brelinski <tony.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index ac5709624c7ad086b59913d7abba49b82a8bd71d..1fd8cc5ac306c57cfe9f476c87b30837730251f7 100644 (file)
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -3185,7 +3185,8 @@ static netdev_features_t i40evf_fix_features(struct net_device *netdev,
 {
        struct i40evf_adapter *adapter = netdev_priv(netdev);
 
-       if (!(adapter->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_VLAN))
+       if (adapter->vf_res &&
+           !(adapter->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_VLAN))
                features &= ~(NETIF_F_HW_VLAN_CTAG_TX |
                              NETIF_F_HW_VLAN_CTAG_RX |
                              NETIF_F_HW_VLAN_CTAG_FILTER);