netdev - [PATCH net] i40e: Fix use-after-free in i40e_client

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Date:   Mon, 12 Apr 2021 22:41:18 +0800
From:   wangyunjian <wangyunjian@...wei.com>
To:     <kuba@...nel.org>, <davem@...emloft.net>
CC:     <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
        <dingxiaoxiong@...wei.com>, Yunjian Wang <wangyunjian@...wei.com>
Subject: [PATCH net] i40e: Fix use-after-free in i40e_client_subtask()

From: Yunjian Wang <wangyunjian@...wei.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 <wangyunjian@...wei.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