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regulator: fix use after free issue 

[ Upstream commit 4affd79a12 ]

This is caused by dereferencing 'rdev' after put_device() in
the _regulator_get()/_regulator_put() functions.
This patch just moves the put_device() down a bit to avoid the
issue.

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/20191124145835.25999-1-wenyang@linux.alibaba.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Wen Yang 2019-11-24 22:58:35 +08:00 committed by Greg Kroah-Hartman
parent 10597f80eb
commit 8d333a5d26
1 changed files with 2 additions and 2 deletions
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4
drivers/regulator/core.c
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@ -1937,8 +1937,8 @@ struct regulator *_regulator_get(struct device *dev, const char *id,
regulator = create_regulator(rdev, dev, id);
if (regulator == NULL) {
regulator = ERR_PTR(-ENOMEM);
put_device(&rdev->dev);
module_put(rdev->owner);
put_device(&rdev->dev);
return regulator;
}
@ -2059,13 +2059,13 @@ static void _regulator_put(struct regulator *regulator)
rdev->open_count--;
rdev->exclusive = 0;
put_device(&rdev->dev);
regulator_unlock(rdev);
kfree_const(regulator->supply_name);
kfree(regulator);
module_put(rdev->owner);
put_device(&rdev->dev);
}
/**