linux-kernel - [PATCH v2] regulator: Fix memory leak in set_machine

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Date:	Thu, 14 Jul 2011 22:06:30 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH v2] regulator: Fix memory leak in set_machine_constraints()
 error paths

Properly kfree rdev->constraints in all set_machine_constraints() error paths.
Also properly kfree rdev->constraints in regulator_register() error paths.

Signed-off-by: Axel Lin <axel.lin@...il.com>
---
 drivers/regulator/core.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index f59821f..c0c4034 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -787,7 +787,6 @@ static int machine_constraints_voltage(struct regulator_dev *rdev,
 		if (ret < 0) {
 			rdev_err(rdev, "failed to apply %duV constraint\n",
 				 rdev->constraints->min_uV);
-			rdev->constraints = NULL;
 			return ret;
 		}
 	}
@@ -873,7 +872,7 @@ static int machine_constraints_voltage(struct regulator_dev *rdev,
 static int set_machine_constraints(struct regulator_dev *rdev,
 	const struct regulation_constraints *constraints)
 {
-	int ret = 0;
+	int ret;
 	struct regulator_ops *ops = rdev->desc->ops;
 
 	rdev->constraints = kmemdup(constraints, sizeof(*constraints),
@@ -890,7 +889,6 @@ static int set_machine_constraints(struct regulator_dev *rdev,
 		ret = suspend_prepare(rdev, rdev->constraints->initial_state);
 		if (ret < 0) {
 			rdev_err(rdev, "failed to set suspend state\n");
-			rdev->constraints = NULL;
 			goto out;
 		}
 	}
@@ -917,13 +915,15 @@ static int set_machine_constraints(struct regulator_dev *rdev,
 		ret = ops->enable(rdev);
 		if (ret < 0) {
 			rdev_err(rdev, "failed to enable\n");
-			rdev->constraints = NULL;
 			goto out;
 		}
 	}
 
 	print_constraints(rdev);
+	return 0;
 out:
+	kfree(rdev->constraints);
+	rdev->constraints = NULL;
 	return ret;
 }
 
@@ -2694,6 +2694,7 @@ unset_supplies:
 	unset_regulator_supplies(rdev);
 
 scrub:
+	kfree(rdev->constraints);
 	device_unregister(&rdev->dev);
 	/* device core frees rdev */
 	rdev = ERR_PTR(ret);
-- 
1.7.4.1



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