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regulator: fix crash caused by null driver data

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commit fb6de923ca upstream.

dev_set_drvdata() needs to be called before device_register()
exposes device to userspace. Otherwise kernel crashes after it
gets null pointer from dev_get_drvdata() when userspace tries
to access sysfs entries.

[Removed backtrace for length -- broonie]

Signed-off-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yu Zhao 2018-09-19 15:30:51 -06:00 committed by Greg Kroah-Hartman
parent b6adc1f24b
commit 5eaaa5e9bd
1 changed files with 1 additions and 1 deletions
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2
drivers/regulator/core.c
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@ -4115,13 +4115,13 @@ regulator_register(const struct regulator_desc *regulator_desc,
!rdev->desc->fixed_uV)
rdev->is_switch = true;
dev_set_drvdata(&rdev->dev, rdev);
ret = device_register(&rdev->dev);
if (ret != 0) {
put_device(&rdev->dev);
goto unset_supplies;
}
dev_set_drvdata(&rdev->dev, rdev);
rdev_init_debugfs(rdev);
/* try to resolve regulators supply since a new one was registered */