Messages in this thread Patch in this message | | | From | Wen Yang <> | Subject | [PATCH] regulator: fix use after free issue | Date | Sun, 24 Nov 2019 22:58:35 +0800 |
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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 --- 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 679ad3d..09a3550 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1938,8 +1938,8 @@ 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; } @@ -2063,13 +2063,13 @@ 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); } /** -- 1.8.3.1
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