netdev - [PATCH net 6/8] i40e: Fix potential invalid access when MAC list is empty

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Message-ID: <20250902232131.2739555-7-anthony.l.nguyen@intel.com>
Date: Tue,  2 Sep 2025 16:21:26 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	andrew+netdev@...n.ch,
	netdev@...r.kernel.org
Cc: Zhen Ni <zhen.ni@...ystack.cn>,
	anthony.l.nguyen@...el.com,
	dledford@...hat.com,
	przemyslaw.kitszel@...el.com,
	Paul Menzel <pmenzel@...gen.mpg.de>
Subject: [PATCH net 6/8] i40e: Fix potential invalid access when MAC list is empty

From: Zhen Ni <zhen.ni@...ystack.cn>

list_first_entry() never returns NULL - if the list is empty, it still
returns a pointer to an invalid object, leading to potential invalid
memory access when dereferenced.

Fix this by using list_first_entry_or_null instead of list_first_entry.

Fixes: e3219ce6a775 ("i40e: Add support for client interface for IWARP driver")
Signed-off-by: Zhen Ni <zhen.ni@...ystack.cn>
Reviewed-by: Paul Menzel <pmenzel@...gen.mpg.de>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_client.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_client.c b/drivers/net/ethernet/intel/i40e/i40e_client.c
index 5f1a405cbbf8..518bc738ea3b 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_client.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_client.c
@@ -359,8 +359,8 @@ static void i40e_client_add_instance(struct i40e_pf *pf)
 	if (i40e_client_get_params(vsi, &cdev->lan_info.params))
 		goto free_cdev;
 
-	mac = list_first_entry(&cdev->lan_info.netdev->dev_addrs.list,
-			       struct netdev_hw_addr, list);
+	mac = list_first_entry_or_null(&cdev->lan_info.netdev->dev_addrs.list,
+				       struct netdev_hw_addr, list);
 	if (mac)
 		ether_addr_copy(cdev->lan_info.lanmac, mac->addr);
 	else
-- 
2.47.1