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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Qiushi Wu <wu000273@umn.edu>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 096/128] cpuidle: Fix three reference count leaks
Date:   Fri, 19 Jun 2020 16:33:10 +0200
Message-Id: <20200619141625.211081982@linuxfoundation.org>
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From: Qiushi Wu <wu000273@umn.edu>

[ Upstream commit c343bf1ba5efcbf2266a1fe3baefec9cc82f867f ]

kobject_init_and_add() takes reference even when it fails.
If this function returns an error, kobject_put() must be called to
properly clean up the memory associated with the object.

Previous commit "b8eb718348b8" fixed a similar problem.

Signed-off-by: Qiushi Wu <wu000273@umn.edu>
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/cpuidle/sysfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index 9e98a5fbbc1d..e7e92ed34f0c 100644
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -412,7 +412,7 @@ static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
 		ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle,
 					   &kdev->kobj, "state%d", i);
 		if (ret) {
-			kfree(kobj);
+			kobject_put(&kobj->kobj);
 			goto error_state;
 		}
 		kobject_uevent(&kobj->kobj, KOBJ_ADD);
@@ -542,7 +542,7 @@ static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
 	ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle,
 				   &kdev->kobj, "driver");
 	if (ret) {
-		kfree(kdrv);
+		kobject_put(&kdrv->kobj);
 		return ret;
 	}
 
@@ -636,7 +636,7 @@ int cpuidle_add_sysfs(struct cpuidle_device *dev)
 	error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
 				   "cpuidle");
 	if (error) {
-		kfree(kdev);
+		kobject_put(&kdev->kobj);
 		return error;
 	}
 
-- 
2.25.1