[PATCH] net: ethernet: Fix phy_set_max_speed by checking for NULL

[Aditya Pakki]

phy_device can be a NULL pointer which is further dereferenced
downstream in phy_set_max_speed. This patch avoids such a scenario.

Signed-off-by: Aditya Pakki <pakki...@umn.edu>
---
 drivers/net/ethernet/broadcom/genet/bcmmii.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c 
b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index aceb9b7b55bd..7eaaecb53aa2 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -213,6 +213,8 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
                break;
 
        case PHY_INTERFACE_MODE_MII:
+               if (!phydev)
+                       return -ENODEV;
                phy_name = "external MII";
                phy_set_max_speed(phydev, SPEED_100);
                bcmgenet_sys_writel(priv,
-- 
2.17.1