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.

Fixes: 9177514ce349 ("regulator: fix memory leak on error path of regulator_register()")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/f5035b1b4d40745e66bacd571bbbb5e4644d21a1.1597195321.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 9f4944dad3a193bf97270cf7d226c233da1f3b8d..1561f7555fc6f7bbe095d0b5f2fff45b62587b68 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -5167,6 +5167,7 @@ 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
@@ -5174,9 +5175,8 @@ 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,
@@ -5188,10 +5188,8 @@ 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;
        }
 
        /*
@@ -5244,7 +5242,6 @@ 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",
@@ -5322,13 +5319,11 @@ wash:
        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);