Patch "PM / devfreq: Fix memory leak when fail to register device" has been added to the 4.13-stable tree

Patch "PM / devfreq: Fix memory leak when fail to register device" has been added to the 4.13-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    PM / devfreq: Fix memory leak when fail to register device

to the 4.13-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pm-devfreq-fix-memory-leak-when-fail-to-register-device.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9e14de1077e9c34f141cf98bdba60cdd5193d962 Mon Sep 17 00:00:00 2001
From: Chanwoo Choi <cw00.choi@samsung.com>
Date: Thu, 24 Aug 2017 10:42:48 +0900
Subject: PM / devfreq: Fix memory leak when fail to register device

From: Chanwoo Choi <cw00.choi@samsung.com>

commit 9e14de1077e9c34f141cf98bdba60cdd5193d962 upstream.

When the devfreq_add_device fails to register deivce, the memory
leak of devfreq instance happen. So, this patch fix the memory
leak issue. Before freeing the devfreq instance checks whether
devfreq instance is NULL or not because the device_unregister()
frees the devfreq instance when jumping to the 'err_init'.
It is to prevent the duplicate the kfee(devfreq).

Fixes: ac4b281176a5 ("PM / devfreq: fix duplicated kfree on devfreq pointer")
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/devfreq/devfreq.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -564,7 +564,7 @@ struct devfreq *devfreq_add_device(struc
 	err = device_register(&devfreq->dev);
 	if (err) {
 		mutex_unlock(&devfreq->lock);
-		goto err_out;
+		goto err_dev;
 	}
 
 	devfreq->trans_table =	devm_kzalloc(&devfreq->dev,
@@ -610,6 +610,9 @@ err_init:
 	mutex_unlock(&devfreq_list_lock);
 
 	device_unregister(&devfreq->dev);
+err_dev:
+	if (devfreq)
+		kfree(devfreq);
 err_out:
 	return ERR_PTR(err);
 }


Patches currently in stable-queue which might be from cw00.choi@samsung.com are

queue-4.13/pm-devfreq-fix-memory-leak-when-fail-to-register-device.patch