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regulator: core: fix regulator_register() error paths to properly release rdev

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There are several issues with the error handling code of
the regulator_register() function:
        ret = device_register(&rdev->dev);
        if (ret != 0) {
                put_device(&rdev->dev); --> rdev released
                goto unset_supplies;
        }
...
unset_supplies:
...
        unset_regulator_supplies(rdev); --> use-after-free
...
clean:
        if (dangling_of_gpiod)
                gpiod_put(config->ena_gpiod);
        kfree(rdev);                     --> double free

We add a variable to record the failure of device_register() and
move put_device() down a bit to avoid the above issues.

Fixes: c438b9d017 ("regulator: core: Move registration of regulator device")
Signed-off-by: Wen Yang <wenyang@linux.alibaba.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/20191201030250.38074-1-wenyang@linux.alibaba.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Wen Yang 2019-12-01 11:02:50 +08:00 committed by Mark Brown
parent 4affd79a12
commit a3cde9534e
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GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 2 deletions
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8
drivers/regulator/core.c
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@ -4998,6 +4998,7 @@ regulator_register(const struct regulator_desc *regulator_desc,
struct regulator_dev *rdev;
bool dangling_cfg_gpiod = false;
bool dangling_of_gpiod = false;
bool reg_device_fail = false;
struct device *dev;
int ret, i;
@ -5183,7 +5184,7 @@ regulator_register(const struct regulator_desc *regulator_desc,
dev_set_drvdata(&rdev->dev, rdev);
ret = device_register(&rdev->dev);
if (ret != 0) {
put_device(&rdev->dev);
reg_device_fail = true;
goto unset_supplies;
}
@ -5213,7 +5214,10 @@ regulator_register(const struct regulator_desc *regulator_desc,
clean:
if (dangling_of_gpiod)
gpiod_put(config->ena_gpiod);
kfree(rdev);
if (reg_device_fail)
put_device(&rdev->dev);
else
kfree(rdev);
kfree(config);
rinse:
if (dangling_cfg_gpiod)