linux-kernel - [PATCH] regulator: core: fix possible NULL dereference

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Date:	Wed,  2 Sep 2015 16:14:06 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH] regulator: core: fix possible NULL dereference

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@...torindia.org>
---
 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 7a85ac9..9283d9f 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;
 		}
 	}
-- 
1.9.1

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