Patch "stm class: Fix device leak in open error path" 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

stm class: Fix device leak in open error path

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:
stm-class-fix-device-leak-in-open-error-path.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: Johan Hovold <[email protected]>
Date: Fri, 18 Nov 2016 14:17:31 +0200
Subject: stm class: Fix device leak in open error path

From: Johan Hovold <[email protected]>

commit a0ebf519b8a2666438d999c62995618c710573e5 upstream.

Make sure to drop the reference taken by class_find_device() also on allocation errors in open().

---
 drivers/hwtracing/stm/core.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

@@ -361,7 +361,7 @@ static int stm_char_open(struct inode *i
 	struct stm_file *stmf;
 	struct device *dev;
 	unsigned int major = imajor(inode);
-	int err = -ENODEV;
+	int err = -ENOMEM;
 
 	dev = class_find_device(&stm_class, NULL, &major, major_match);
 	if (!dev)

@@ -369,8 +369,9 @@ static int stm_char_open(struct inode *i
 
 	stmf = kzalloc(sizeof(*stmf), GFP_KERNEL);
 	if (!stmf)
-		return -ENOMEM;
+		goto err_put_device;
 
+	err = -ENODEV;
 	stm_output_init(&stmf->output);
 	stmf->stm = to_stm_device(dev);
 

@@ -382,9 +383,10 @@ static int stm_char_open(struct inode *i
 	return nonseekable_open(inode, file);
 
 err_free:
+	kfree(stmf);
+err_put_device:
 	/* matches class_find_device() above */
 	put_device(dev);
-	kfree(stmf);
 
 	return err;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/stm-class-fix-device-leak-in-open-error-path.patch