linux-kernel - [PATCH 3/5] net: fortify eth_platform_get_mac

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Message-Id: <20180718161035.7005-4-brgl@bgdev.pl>
Date:   Wed, 18 Jul 2018 18:10:33 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "David S . Miller" <davem@...emloft.net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Lukas Wunner <lukas@...ner.de>, Rob Herring <robh@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        David Lechner <david@...hnology.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Lunn <andrew@...n.ch>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 3/5] net: fortify eth_platform_get_mac_address()

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

We'll soon have more sources from which to read the MAC address in this
routine. Make sure the address is correct before returning it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 net/ethernet/eth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 2a2173324d9e..6b64586fd2af 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -544,7 +544,7 @@ int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
 			from = "arch callback";
 	}
 
-	if (!addr)
+	if (!addr || !is_valid_ether_addr(addr))
 		return -ENODEV;
 
 	dev_info(dev, "read MAC address from %s\n", from);
-- 
2.17.1