[PATCH v1 net] net: phy: fix null dereference in phy_attach_direct

[Colin Foster]

Commit bc66fa87d4fd ("net: phy: Add link between phy dev and mac dev")
introduced a link between net devices and phy devices. It fails to check
whether dev is NULL, leading to a NULL dereference error.

Fixes: bc66fa87d4fd ("net: phy: Add link between phy dev and mac dev")
Signed-off-by: Colin Foster <colin.foster@xxxxxxxxxxxxxxxx>
---
 drivers/net/phy/phy_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 9ba8f973f26f..a3917c7acbd3 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1538,7 +1538,7 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 	 * another mac interface, so we should create a device link between
 	 * phy dev and mac dev.
 	 */
-	if (phydev->mdio.bus->parent && dev->dev.parent != phydev->mdio.bus->parent)
+	if (dev && phydev->mdio.bus->parent && dev->dev.parent != phydev->mdio.bus->parent)
 		phydev->devlink = device_link_add(dev->dev.parent, &phydev->mdio.dev,
 						  DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
 
-- 
2.25.1