netdev - [PATCH v2 net-next 03/11] net: phy: Check against net

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Message-Id: <1559065097-31832-4-git-send-email-ioana.ciornei@nxp.com>
Date:   Tue, 28 May 2019 20:38:09 +0300
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     linux@...linux.org.uk, f.fainelli@...il.com, andrew@...n.ch,
        hkallweit1@...il.com, maxime.chevallier@...tlin.com,
        olteanv@...il.com, thomas.petazzoni@...tlin.com,
        davem@...emloft.net, vivien.didelot@...il.com
Cc:     netdev@...r.kernel.org, Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH v2 net-next 03/11] net: phy: Check against net_device being NULL

In general, we don't want MAC drivers calling phy_attach_direct with the
net_device being NULL. Add checks against this in all the functions
calling it: phy_attach() and phy_connect_direct().

Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
Suggested-by: Andrew Lunn <andrew@...n.ch>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
Changes in v2:
 - return directly -EINVAL instead of ERR_PTR(-EINVAL) in phy_connect_direct

 drivers/net/phy/phy_device.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index da3bf3f70d63..1b540ed9b326 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -948,6 +948,9 @@ int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
 {
 	int rc;
 
+	if (!dev)
+		return -EINVAL;
+
 	rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
 	if (rc)
 		return rc;
@@ -1307,6 +1310,9 @@ struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
 	struct device *d;
 	int rc;
 
+	if (!dev)
+		return ERR_PTR(-EINVAL);
+
 	/* Search the list of PHY devices on the mdio bus for the
 	 * PHY with the requested name
 	 */
-- 
1.9.1