[PATCH net] i40e: Fix use-after-free in i40e_client_subtask()

[wangyunjian]

From: Yunjian Wang <wangyunj...@huawei.com>

Currently the call to i40e_client_del_instance frees the object
pf->cinst, however pf->cinst->lan_info is being accessed after
the free. Fix this by adding the missing return.

Addresses-Coverity: ("Read from pointer after free")
Fixes: 7b0b1a6d0ac9 ("i40e: Disable iWARP VSI PETCP_ENA flag on netdev down 
events")
Signed-off-by: Yunjian Wang <wangyunj...@huawei.com>
---
 drivers/net/ethernet/intel/i40e/i40e_client.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_client.c 
b/drivers/net/ethernet/intel/i40e/i40e_client.c
index a2dba32383f6..32f3facbed1a 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_client.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_client.c
@@ -375,6 +375,7 @@ void i40e_client_subtask(struct i40e_pf *pf)
                                clear_bit(__I40E_CLIENT_INSTANCE_OPENED,
                                          &cdev->state);
                                i40e_client_del_instance(pf);
+                               return;
                        }
                }
        }
-- 
2.23.0