linux-kernel - [PATCH v2 1/8] regulator: arizona-micsupp: Avoid potential memory leak reading init

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Date:   Tue, 28 Mar 2017 15:14:37 +0100
From:   Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:     <broonie@...nel.org>
CC:     <lgirdwood@...il.com>, <lee.jones@...aro.org>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>,
        <patches@...nsource.wolfsonmicro.com>
Subject: [PATCH v2 1/8] regulator: arizona-micsupp: Avoid potential memory leak reading init_data

The device argument passed to of_get_regulator_init_data is used to
do some devres memory allocation. Currently the driver passes the MFD
device pointer to this function, this could result in the init_data
allocation being leaked if the regulator is unbound but the MFD isn't.

Correct this issue by correctly passing the local platform device.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---

New patch in the series since v1.

 drivers/regulator/arizona-micsupp.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/regulator/arizona-micsupp.c b/drivers/regulator/arizona-micsupp.c
index 22bd714..5e38861 100644
--- a/drivers/regulator/arizona-micsupp.c
+++ b/drivers/regulator/arizona-micsupp.c
@@ -199,7 +199,8 @@ static const struct regulator_init_data arizona_micsupp_ext_default = {
 	.num_consumer_supplies = 1,
 };
 
-static int arizona_micsupp_of_get_pdata(struct arizona *arizona,
+static int arizona_micsupp_of_get_pdata(struct device *dev,
+					struct arizona *arizona,
 					struct regulator_config *config,
 					const struct regulator_desc *desc)
 {
@@ -213,7 +214,7 @@ static int arizona_micsupp_of_get_pdata(struct arizona *arizona,
 	if (np) {
 		config->of_node = np;
 
-		init_data = of_get_regulator_init_data(arizona->dev, np, desc);
+		init_data = of_get_regulator_init_data(dev, np, desc);
 
 		if (init_data) {
 			init_data->consumer_supplies = &micsupp->supply;
@@ -268,8 +269,8 @@ static int arizona_micsupp_probe(struct platform_device *pdev)
 
 	if (IS_ENABLED(CONFIG_OF)) {
 		if (!dev_get_platdata(arizona->dev)) {
-			ret = arizona_micsupp_of_get_pdata(arizona, &config,
-							   desc);
+			ret = arizona_micsupp_of_get_pdata(&pdev->dev, arizona,
+							   &config, desc);
 			if (ret < 0)
 				return ret;
 		}
-- 
2.1.4