linux-kernel - [PATCH 4.9 282/329] regulator: gpio: Fix some error handling paths in gpio_regulator

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Date:   Mon, 28 May 2018 12:03:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 282/329] regulator: gpio: Fix some error handling paths in gpio_regulator_probe()

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe Jaillet <christophe.jaillet@...adoo.fr>

[ Upstream commit ed8cffda27dea6fd3dafb3ee881c5a786edac9ca ]

Re-order error handling code and gotos to avoid leaks in error handling
paths.

Fixes: 9f946099fe19 ("regulator: gpio: fix parsing of gpio list")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/regulator/gpio-regulator.c |   16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

--- a/drivers/regulator/gpio-regulator.c
+++ b/drivers/regulator/gpio-regulator.c
@@ -268,8 +268,7 @@ static int gpio_regulator_probe(struct p
 	drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
 	if (drvdata->desc.name == NULL) {
 		dev_err(&pdev->dev, "Failed to allocate supply name\n");
-		ret = -ENOMEM;
-		goto err;
+		return -ENOMEM;
 	}
 
 	if (config->nr_gpios != 0) {
@@ -289,7 +288,7 @@ static int gpio_regulator_probe(struct p
 				dev_err(&pdev->dev,
 					"Could not obtain regulator setting GPIOs: %d\n",
 					ret);
-			goto err_memstate;
+			goto err_memgpio;
 		}
 	}
 
@@ -300,7 +299,7 @@ static int gpio_regulator_probe(struct p
 	if (drvdata->states == NULL) {
 		dev_err(&pdev->dev, "Failed to allocate state data\n");
 		ret = -ENOMEM;
-		goto err_memgpio;
+		goto err_stategpio;
 	}
 	drvdata->nr_states = config->nr_states;
 
@@ -321,7 +320,7 @@ static int gpio_regulator_probe(struct p
 	default:
 		dev_err(&pdev->dev, "No regulator type set\n");
 		ret = -EINVAL;
-		goto err_memgpio;
+		goto err_memstate;
 	}
 
 	/* build initial state from gpio init data. */
@@ -358,22 +357,21 @@ static int gpio_regulator_probe(struct p
 	if (IS_ERR(drvdata->dev)) {
 		ret = PTR_ERR(drvdata->dev);
 		dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
-		goto err_stategpio;
+		goto err_memstate;
 	}
 
 	platform_set_drvdata(pdev, drvdata);
 
 	return 0;
 
-err_stategpio:
-	gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
 err_memstate:
 	kfree(drvdata->states);
+err_stategpio:
+	gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
 err_memgpio:
 	kfree(drvdata->gpios);
 err_name:
 	kfree(drvdata->desc.name);
-err:
 	return ret;
 }