linux-kernel - [PATCH] net: renesas: fix a potential NULL pointer dereference

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Message-Id: <20190311070138.24084-1-kjlu@umn.edu>
Date:   Mon, 11 Mar 2019 02:01:36 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        "David S. Miller" <davem@...emloft.net>,
        Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Vladimir Barinov <vladimir.barinov@...entembedded.com>,
        Chris Brandt <chris.brandt@...esas.com>,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: renesas: fix a potential NULL pointer dereference

In case of_get_phy_mode fails, the fix returns NULL to avoid
the NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/ethernet/renesas/sh_eth.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 339b2eae2100..b119587ec673 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -3187,6 +3187,8 @@ static struct sh_eth_plat_data *sh_eth_parse_dt(struct device *dev)
 		return NULL;
 
 	pdata->phy_interface = of_get_phy_mode(np);
+	if (unlikely(!pdata->phy_interface))
+		return NULL;
 
 	mac_addr = of_get_mac_address(np);
 	if (mac_addr)
-- 
2.17.1