Commit 5eaaa5e9 authored Sep 19, 2018 by Yu Zhao Committed by Greg Kroah-Hartman Oct 03, 2018

regulator: fix crash caused by null driver data



commit fb6de923ca3358a91525552b4907d4cb38730bdd 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>

parent b6adc1f2

drivers/regulator/core.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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 */