net: cpsw: fix null dereference at probe
authorJohan Hovold <jhovold@gmail.com>
Thu, 8 May 2014 08:09:23 +0000 (10:09 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 1 Jul 2014 03:09:41 +0000 (20:09 -0700)
commit 6954cc1f238199e971ec905c5cc87120806ac981 upstream.

Fix null-pointer dereference at probe when the mdio platform device is
missing (e.g. when it has been disabled in DT).

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/net/ethernet/ti/cpsw.c

index d1a769f..b1ab3a4 100644 (file)
@@ -1547,6 +1547,10 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data,
                mdio_node = of_find_node_by_phandle(be32_to_cpup(parp));
                phyid = be32_to_cpup(parp+1);
                mdio = of_find_device_by_node(mdio_node);
+               if (!mdio) {
+                       pr_err("Missing mdio platform device\n");
+                       return -EINVAL;
+               }
                snprintf(slave_data->phy_id, sizeof(slave_data->phy_id),
                         PHY_ID_FMT, mdio->name, phyid);