[PATCH] regulator: core: fix possible NULL dereference

From: Sudip Mukherjee
Date: Wed Sep 02 2015 - 06:44:06 EST


We were checking rdev->supply for NULL after dereferencing it. Lets
check for rdev->supply along with _regulator_is_enabled() and call
regulator_enable() only if rdev->supply is not NULL.

Signed-off-by: Sudip Mukherjee <sudip@xxxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
drivers/regulator/core.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index de9f272a0faf..7150ff6ef46b 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1422,11 +1422,10 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
return ret;

/* Cascade always-on state to supply */
- if (_regulator_is_enabled(rdev)) {
+ if (_regulator_is_enabled(rdev) && rdev->supply) {
ret = regulator_enable(rdev->supply);
if (ret < 0) {
- if (rdev->supply)
- _regulator_put(rdev->supply);
+ _regulator_put(rdev->supply);
return ret;
}
}
--
2.5.0

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