netdev - [PATCH net-next 3/4] net: mvpp2: fix use of the random mac address for PPv2.2

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20170824094658.1296-4-antoine.tenart@free-electrons.com>
Date:   Thu, 24 Aug 2017 11:46:57 +0200
From:   Antoine Tenart <antoine.tenart@...e-electrons.com>
To:     davem@...emloft.net, thomas.petazzoni@...e-electrons.com
Cc:     Antoine Tenart <antoine.tenart@...e-electrons.com>, andrew@...n.ch,
        gregory.clement@...e-electrons.com, nadavh@...vell.com,
        linux@...linux.org.uk, linux-kernel@...r.kernel.org,
        mw@...ihalf.com, stefanc@...vell.com, netdev@...r.kernel.org
Subject: [PATCH net-next 3/4] net: mvpp2: fix use of the random mac address for PPv2.2

The MAC retrieval logic is using a variable to store an h/w stored mac
address and checks this mac against invalid ones before using it. But
the mac address is only read from h/w when using PPv2.1. So when using
PPv2.2 it defaults to its init state.

This patches fixes the logic to only check if the h/w mac is valid when
actually retrieving a mac from h/w.

Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
---
 drivers/net/ethernet/marvell/mvpp2.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c
index 908e5b148fd7..fe8309124a09 100644
--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -7466,15 +7466,17 @@ static void mvpp2_port_copy_mac_addr(struct net_device *dev, struct mvpp2 *priv,
 		*mac_from = "device tree";
 		ether_addr_copy(dev->dev_addr, dt_mac_addr);
 	} else {
-		if (priv->hw_version == MVPP21)
+		if (priv->hw_version == MVPP21) {
 			mvpp21_get_mac_address(port, hw_mac_addr);
-		if (is_valid_ether_addr(hw_mac_addr)) {
-			*mac_from = "hardware";
-			ether_addr_copy(dev->dev_addr, hw_mac_addr);
-		} else {
-			*mac_from = "random";
-			eth_hw_addr_random(dev);
+			if (is_valid_ether_addr(hw_mac_addr)) {
+				*mac_from = "hardware";
+				ether_addr_copy(dev->dev_addr, hw_mac_addr);
+				return;
+			}
 		}
+
+		*mac_from = "random";
+		eth_hw_addr_random(dev);
 	}
 }
 
-- 
2.13.5