linux-kernel - [PATCH 5/7] regulator: plug of_node leak in regulator

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Date:   Tue, 11 Aug 2020 03:07:40 +0200
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Dmitry Osipenko <digetx@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Vladimir Zapolskiy <vz@...ia.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 5/7] regulator: plug of_node leak in regulator_register()'s
 error path

By calling device_initialize() earlier and noting that kfree(NULL) is
ok, we can save a bit of code in error handling and plug of_node leak.
Fixed commit already did part of the work.

Cc: stable@...r.kernel.org
Fixes: 9177514ce349 ("regulator: fix memory leak on error path of regulator_register()")
Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 drivers/regulator/core.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 0408c4e1d9a8..a9ff2ad55ee7 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -5137,6 +5137,7 @@ regulator_register(const struct regulator_desc *regulator_desc,
 		ret = -ENOMEM;
 		goto rinse;
 	}
+	device_initialize(&rdev->dev);
 
 	/*
 	 * Duplicate the config so the driver could override it after
@@ -5144,9 +5145,8 @@ regulator_register(const struct regulator_desc *regulator_desc,
 	 */
 	config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
 	if (config == NULL) {
-		kfree(rdev);
 		ret = -ENOMEM;
-		goto rinse;
+		goto clean;
 	}
 
 	init_data = regulator_of_get_init_data(dev, regulator_desc, config,
@@ -5158,10 +5158,8 @@ regulator_register(const struct regulator_desc *regulator_desc,
 	 * from a gpio extender or something else.
 	 */
 	if (PTR_ERR(init_data) == -EPROBE_DEFER) {
-		kfree(config);
-		kfree(rdev);
 		ret = -EPROBE_DEFER;
-		goto rinse;
+		goto clean;
 	}
 
 	/*
@@ -5214,7 +5212,6 @@ regulator_register(const struct regulator_desc *regulator_desc,
 	}
 
 	/* register with sysfs */
-	device_initialize(&rdev->dev);
 	rdev->dev.class = &regulator_class;
 	rdev->dev.parent = dev;
 	dev_set_name(&rdev->dev, "regulator.%lu",
@@ -5292,13 +5289,11 @@ regulator_register(const struct regulator_desc *regulator_desc,
 	mutex_lock(&regulator_list_mutex);
 	regulator_ena_gpio_free(rdev);
 	mutex_unlock(&regulator_list_mutex);
-	put_device(&rdev->dev);
-	rdev = NULL;
 clean:
 	if (dangling_of_gpiod)
 		gpiod_put(config->ena_gpiod);
-	kfree(rdev);
 	kfree(config);
+	put_device(&rdev->dev);
 rinse:
 	if (dangling_cfg_gpiod)
 		gpiod_put(cfg->ena_gpiod);
-- 
2.20.1