From: Dan Carpenter <dan.carpen...@oracle.com>

commit 227f33beab746aeec4ef3305bd17b1d374df09e7 upstream.

We could end up dereferencing an error pointer when we call
regulator_disable().

Fixes: 4bdcb1dd9feb ('net: Add MDIO bus driver for the Allwinner EMAC')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Acked-by: Chen-Yu Tsai <w...@csie.org>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/net/phy/mdio-sun4i.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/phy/mdio-sun4i.c
+++ b/drivers/net/phy/mdio-sun4i.c
@@ -134,6 +134,7 @@ static int sun4i_mdio_probe(struct platf
                }
 
                dev_info(&pdev->dev, "no regulator found\n");
+               data->regulator = NULL;
        } else {
                ret = regulator_enable(data->regulator);
                if (ret)
@@ -149,7 +150,8 @@ static int sun4i_mdio_probe(struct platf
        return 0;
 
 err_out_disable_regulator:
-       regulator_disable(data->regulator);
+       if (data->regulator)
+               regulator_disable(data->regulator);
 err_out_free_mdiobus:
        mdiobus_free(bus);
        return ret;


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