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SubjectApplied "regulator: core: fix regulator_register() error paths to properly release rdev" to the regulator tree
The patch

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

has been applied to the regulator tree at for-5.5

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
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From a3cde9534ebdafe18a9bbab208df724c57e6c8e8 Mon Sep 17 00:00:00 2001
From: Wen Yang <>
Date: Sun, 1 Dec 2019 11:02:50 +0800
Subject: [PATCH] regulator: core: fix regulator_register() error paths to
properly release rdev

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_regulator_supplies(rdev); --> use-after-free
if (dangling_of_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: c438b9d01736 ("regulator: core: Move registration of regulator device")
Signed-off-by: Wen Yang <>
Cc: Liam Girdwood <>
Cc: Mark Brown <>
Signed-off-by: Mark Brown <>
drivers/regulator/core.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index c80f3fd9532d..2c3a03cfd381 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -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,
if (dangling_of_gpiod)
- kfree(rdev);
+ if (reg_device_fail)
+ put_device(&rdev->dev);
+ else
+ kfree(rdev);
if (dangling_cfg_gpiod)
 \ /
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