From 20b08e1a793d898f0f13040d5418ee0955f678cf Mon Sep 17 00:00:00 2001 From: Tobias Klauser Date: Mon, 14 Dec 2015 13:51:51 +0100 Subject: [PATCH] net: phy: mdio-mux: Check return value of mdiobus_alloc() mdiobus_alloc() might return NULL, but its return value is not checked in mdio_mux_init(). This could potentially lead to a NULL pointer dereference. Fix it by checking the return value Fixes: 0ca2997d1452 ("netdev/of/phy: Add MDIO bus multiplexer support.") Signed-off-by: Tobias Klauser Signed-off-by: David S. Miller --- drivers/net/phy/mdio-mux.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c index 908e8d486342..7f8e7662e28c 100644 --- a/drivers/net/phy/mdio-mux.c +++ b/drivers/net/phy/mdio-mux.c @@ -149,9 +149,14 @@ int mdio_mux_init(struct device *dev, } cb->bus_number = v; cb->parent = pb; - cb->mii_bus = mdiobus_alloc(); - cb->mii_bus->priv = cb; + cb->mii_bus = mdiobus_alloc(); + if (!cb->mii_bus) { + ret_val = -ENOMEM; + of_node_put(child_bus_node); + break; + } + cb->mii_bus->priv = cb; cb->mii_bus->irq = cb->phy_irq; cb->mii_bus->name = "mdio_mux"; snprintf(cb->mii_bus->id, MII_BUS_ID_SIZE, "%x.%x",