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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@gmx.de>
Acked-by: David Daney <david.daney@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
xypron.glpk@gmx.de 2016-05-17 21:40:38 +02:00 committed by David S. Miller
parent 07b75260eb
commit 099a728d58
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/cavium/thunder/thunder_bgx.c
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@ -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;