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i40e: Fix potential invalid access when MAC list is empty

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[ Upstream commit a556f06338e1d5a85af0e32ecb46e365547f92b9 ]

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: e3219ce6a7 ("i40e: Add support for client interface for IWARP driver")
Signed-off-by: Zhen Ni <zhen.ni@easystack.cn>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhen Ni 2025-08-27 19:56:31 +08:00 • committed by Greg Kroah-Hartman
commit 971feafe15
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/intel/i40e/i40e_client.c
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@ -320,8 +320,8 @@ static void i40e_client_add_instance(struct i40e_pf *pf)
return;
}
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