netdev - [patch] mdio-sun4i: oops in error handling in probe

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Date:	Mon, 21 Mar 2016 12:02:31 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Florian Fainelli <f.fainelli@...il.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Chen-Yu Tsai <wens@...e.org>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] mdio-sun4i: oops in error handling in probe

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.carpenter@...cle.com>

diff --git a/drivers/net/phy/mdio-sun4i.c b/drivers/net/phy/mdio-sun4i.c
index f70522c..1352965 100644
--- a/drivers/net/phy/mdio-sun4i.c
+++ b/drivers/net/phy/mdio-sun4i.c
@@ -122,6 +122,7 @@ static int sun4i_mdio_probe(struct platform_device *pdev)
 			return -EPROBE_DEFER;
 
 		dev_info(&pdev->dev, "no regulator found\n");
+		data->regulator = NULL;
 	} else {
 		ret = regulator_enable(data->regulator);
 		if (ret)
@@ -137,7 +138,8 @@ static int sun4i_mdio_probe(struct platform_device *pdev)
 	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;