Patch "PM / devfreq: Fix memory leak when fail to register device" has been added to the 4.9-stable tree

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 4.9-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-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Chanwoo Choi <[email protected]>
Date: Thu, 24 Aug 2017 10:42:48 +0900
Subject: PM / devfreq: Fix memory leak when fail to register device

From: Chanwoo Choi <[email protected]>

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).

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

@@ -574,7 +574,7 @@ 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, sizeof(unsigned int) *

@@ -618,6 +618,9 @@ 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 [email protected] are

queue-4.9/pm-devfreq-fix-memory-leak-when-fail-to-register-device.patch