net/ice: fix crash on representor port closing

If DCF representor port is closed after DCF port is closed, there will
be segmentation fault because representor accesses the released resource
of DCF port.

This patch checks if the resource is present before accessing.

Fixes: 5674465a32c8 ("net/ice: add DCF VLAN handling")
Cc: stable@dpdk.org
Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
Acked-by: Haiyue Wang <haiyue.wang@intel.com>

diff --git a/drivers/net/ice/ice_dcf_vf_representor.c b/drivers/net/ice/ice_dcf_vf_representor.c
index 970461f..b547c42 100644 (file)
--- a/drivers/net/ice/ice_dcf_vf_representor.c
+++ b/drivers/net/ice/ice_dcf_vf_representor.c
@@ -114,6 +114,11 @@ ice_dcf_vf_repr_hw(struct ice_dcf_vf_repr *repr)
        struct ice_dcf_adapter *dcf_adapter =
                        repr->dcf_eth_dev->data->dev_private;
 
+       if (!dcf_adapter) {
+               PMD_DRV_LOG(ERR, "DCF for VF representor has been released\n");
+               return NULL;
+       }
+
        return &dcf_adapter->real_hw;
 }
 
@@ -124,6 +129,9 @@ ice_dcf_vf_repr_dev_info_get(struct rte_eth_dev *dev,
        struct ice_dcf_vf_repr *repr = dev->data->dev_private;
        struct ice_dcf_hw *dcf_hw = ice_dcf_vf_repr_hw(repr);
 
+       if (!dcf_hw)
+               return -EIO;
+
        dev_info->device = dev->device;
        dev_info->max_mac_addrs = 1;
        dev_info->max_rx_queues = dcf_hw->vsi_res->num_queue_pairs;