linux-kernel - [PATCH net-next] net: ethernet: mediatek: get out of potential invalid pointer access

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Message-ID: <1474533856-22753-1-git-send-email-sean.wang@mediatek.com>
Date:   Thu, 22 Sep 2016 16:44:16 +0800
From:   <sean.wang@...iatek.com>
To:     <john@...ozen.org>, <davem@...emloft.net>
CC:     <nbd@...nwrt.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <keyhaede@...il.com>,
        <objelf@...il.com>, Sean Wang <sean.wang@...iatek.com>
Subject: [PATCH net-next] net: ethernet: mediatek: get out of potential invalid pointer access

From: Sean Wang <sean.wang@...iatek.com>

Potential dangerous invalid pointer might be accessed if
the error happens when couple phy_device to net_device so
cleanup the error path.

Signed-off-by: Sean Wang <sean.wang@...iatek.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index a65801a..3d7e0cb 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -296,7 +296,9 @@ static int mtk_phy_connect(struct net_device *dev)
 	regmap_write(eth->ethsys, ETHSYS_SYSCFG0, val);
 
 	/* couple phydev to net_device */
-	mtk_phy_connect_node(eth, mac, np);
+	if (mtk_phy_connect_node(eth, mac, np))
+		goto err_phy;
+
 	dev->phydev->autoneg = AUTONEG_ENABLE;
 	dev->phydev->speed = 0;
 	dev->phydev->duplex = 0;
@@ -317,7 +319,7 @@ static int mtk_phy_connect(struct net_device *dev)
 
 err_phy:
 	of_node_put(np);
-	dev_err(eth->dev, "invalid phy_mode\n");
+	dev_err(eth->dev, "%s: invalid phy\n", __func__);
 	return -EINVAL;
 }
 
-- 
1.9.1