From 099a728d5819da80ff9fff3df980ea6e89a01e60 Mon Sep 17 00:00:00 2001 From: "xypron.glpk@gmx.de" Date: Tue, 17 May 2016 21:40:38 +0200 Subject: [PATCH] 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 Acked-by: David Daney Signed-off-by: David S. Miller --- 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 d20539a6d162..3ed21988626b 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; -- 2.20.1