linux-kernel - [PATCH 3.16 180/212] net: ethernet: bgmac: mac address change bug

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Message-ID: <lsq.1496331796.554150955@decadent.org.uk>
Date:   Thu, 01 Jun 2017 16:43:16 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Hari Vyas" <hariv@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Jon Mason" <jon.mason@...adcom.com>
Subject: [PATCH 3.16 180/212] net: ethernet: bgmac: mac address change bug

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit fa42245dff4a5f2f8f208da542acbd80c22f7c65 upstream.

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")
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ethernet/broadcom/bgmac.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -1238,12 +1238,16 @@ static netdev_tx_t bgmac_start_xmit(stru
 static int bgmac_set_mac_address(struct net_device *net_dev, void *addr)
 {
 	struct bgmac *bgmac = netdev_priv(net_dev);
+	struct sockaddr *sa = addr;
 	int ret;
 
 	ret = eth_prepare_mac_addr_change(net_dev, addr);
 	if (ret < 0)
 		return ret;
-	bgmac_write_mac_address(bgmac, (u8 *)addr);
+
+	ether_addr_copy(net_dev->dev_addr, sa->sa_data);
+	bgmac_write_mac_address(bgmac, net_dev->dev_addr);
+
 	eth_commit_mac_addr_change(net_dev, addr);
 	return 0;
 }