netdev - [PATCH net-next 3/4] wilc1000: copy address before calling wilc_set_mac

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Message-Id: <20211118142720.3176980-4-kuba@kernel.org>
Date:   Thu, 18 Nov 2021 06:27:19 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        Kalle Valo <kvalo@...eaurora.org>, ajay.kathat@...rochip.com,
        claudiu.beznea@...rochip.com
Subject: [PATCH net-next 3/4] wilc1000: copy address before calling wilc_set_mac_address

wilc_set_mac_address() calls IO routines which don't guarantee
the pointer won't be written to. Make a copy.

Acked-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: ajay.kathat@...rochip.com
CC: claudiu.beznea@...rochip.com
---
 drivers/net/wireless/microchip/wilc1000/netdev.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/microchip/wilc1000/netdev.c b/drivers/net/wireless/microchip/wilc1000/netdev.c
index 690572e01a2a..4712cd7dff9f 100644
--- a/drivers/net/wireless/microchip/wilc1000/netdev.c
+++ b/drivers/net/wireless/microchip/wilc1000/netdev.c
@@ -574,6 +574,7 @@ static int wilc_mac_open(struct net_device *ndev)
 	struct wilc *wl = vif->wilc;
 	int ret = 0;
 	struct mgmt_frame_regs mgmt_regs = {};
+	u8 addr[ETH_ALEN] __aligned(2);
 
 	if (!wl || !wl->dev) {
 		netdev_err(ndev, "device not ready\n");
@@ -596,10 +597,9 @@ static int wilc_mac_open(struct net_device *ndev)
 				vif->idx);
 
 	if (is_valid_ether_addr(ndev->dev_addr)) {
-		wilc_set_mac_address(vif, ndev->dev_addr);
+		ether_addr_copy(addr, ndev->dev_addr);
+		wilc_set_mac_address(vif, addr);
 	} else {
-		u8 addr[ETH_ALEN];
-
 		wilc_get_mac_address(vif, addr);
 		eth_hw_addr_set(ndev, addr);
 	}
-- 
2.31.1