lkml.org 
[lkml]   [2019]   [Dec]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH AUTOSEL 4.19 01/84] regulator: fix use after free issue
Date
From: Wen Yang <wenyang@linux.alibaba.com>

[ Upstream commit 4affd79a125ac91e6a53be843ea3960a8fc00cbb ]

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>
---
drivers/regulator/core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index f312764660e6..4bab758d14b1 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1724,8 +1724,8 @@ 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;
}

@@ -1851,13 +1851,13 @@ 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);
}

/**
--
2.20.1
\
 
 \ /
  Last update: 2019-12-27 18:51    [W:0.237 / U:6.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site