linux-kernel - [PATCH 2/2] net: ethernet: bgmac: mac address change bug

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Message-Id: <1485988752-21030-3-git-send-email-jon.mason@broadcom.com>
Date:   Wed,  1 Feb 2017 17:39:12 -0500
From:   Jon Mason <jon.mason@...adcom.com>
To:     David Miller <davem@...emloft.net>
Cc:     rafal@...ecki.pl, bcm-kernel-feedback-list@...adcom.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hari Vyas <hariv@...adcom.com>
Subject: [PATCH 2/2] net: ethernet: bgmac: mac address change bug

From: Hari Vyas <hariv@...adcom.com>

ndo_set_mac_address() passes struct sockaddr * as 2nd parameter to
bgmac_set_mac_address() but code assumed u8 *.  This caused two bytes
chopping and the wrong mac address was configured.

Signed-off-by: Hari Vyas <hariv@...adcom.com>
Signed-off-by: Jon Mason <jon.mason@...adcom.com>
Fixes: 4e209001b86 ("bgmac: write mac address to hardware in ndo_set_mac_address")
---
 drivers/net/ethernet/broadcom/bgmac.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 0e066dc6..ea24072 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -1222,11 +1222,15 @@ static int bgmac_set_mac_address(struct net_device *net_dev, void *addr)
 {
 	struct bgmac *bgmac = netdev_priv(net_dev);
 	int ret;
+	struct sockaddr *sa = addr;
 
 	ret = eth_prepare_mac_addr_change(net_dev, addr);
 	if (ret < 0)
 		return ret;
-	bgmac_write_mac_address(bgmac, (u8 *)addr);
+
+	ether_addr_copy(bgmac->mac_addr, sa->sa_data);
+	bgmac_write_mac_address(bgmac, bgmac->mac_addr);
+
 	eth_commit_mac_addr_change(net_dev, addr);
 	return 0;
 }
-- 
2.7.4