powerpc/82xx: kmalloc failure ignored in ep8248e_mdio_probe()

Prevent NULL dereference if kmalloc() fails. Also clean up if
of_mdiobus_register() returns an error.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 14 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/82xx/ep8248e.c b/arch/powerpc/platforms/82xx/ep8248e.c
index 51fcae41f08a..f9aee182e6f7 100644
--- a/arch/powerpc/platforms/82xx/ep8248e.c
+++ b/arch/powerpc/platforms/82xx/ep8248e.c
@@ -132,12 +132,25 @@ static int __devinit ep8248e_mdio_probe(struct of_device *ofdev,
                 return -ENOMEM;
 
         bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
+        if (bus->irq == NULL) {
+                ret = -ENOMEM;
+                goto err_free_bus;
+        }
 
         bus->name = "ep8248e-mdio-bitbang";
         bus->parent = &ofdev->dev;
         snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 
-        return of_mdiobus_register(bus, ofdev->node);
+        ret = of_mdiobus_register(bus, ofdev->node);
+        if (ret)
+                goto err_free_irq;
+
+        return 0;
+err_free_irq:
+        kfree(bus->irq);
+err_free_bus:
+        free_mdio_bitbang(bus);
+        return ret;
 }
 
 static int ep8248e_mdio_remove(struct of_device *ofdev)