linux-kernel - [PATCH 1/1] net: thunderx: avoid null pointer dereference

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Date:	Tue, 17 May 2016 21:40:38 +0200
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	Sunil Goutham <sgoutham@...ium.com>,
	Robert Richter <rric@...nel.org>
Cc:	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Heinrich Schuchardt <xypron.glpk@....de>
Subject: [PATCH 1/1] net: thunderx: avoid null pointer dereference

In function bgx_lmac_handler only use a member of
lmac after checking it is not null.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
---
 drivers/net/ethernet/cavium/thunder/thunder_bgx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
index d20539a..3ed2198 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -274,12 +274,14 @@ static void bgx_sgmii_change_link_state(struct lmac *lmac)
 static void bgx_lmac_handler(struct net_device *netdev)
 {
 	struct lmac *lmac = container_of(netdev, struct lmac, netdev);
-	struct phy_device *phydev = lmac->phydev;
+	struct phy_device *phydev;
 	int link_changed = 0;
 
 	if (!lmac)
 		return;
 
+	phydev = lmac->phydev;
+
 	if (!phydev->link && lmac->last_link)
 		link_changed = -1;
 
-- 
2.1.4