Patch "bcache: Fix leak of bdev reference" 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

bcache: Fix leak of bdev reference

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:
bcache-fix-leak-of-bdev-reference.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: Jan Kara <[email protected]>
Date: Wed, 6 Sep 2017 14:25:51 +0800
Subject: bcache: Fix leak of bdev reference

From: Jan Kara <[email protected]>

commit 4b758df21ee7081ab41448d21d60367efaa625b3 upstream.

If blkdev_get_by_path() in register_bcache() fails, we try to lookup the block device using lookup_bdev() to detect which situation we are in to properly report error. However we never drop the reference returned to us from lookup_bdev(). Fix that.

---
 drivers/md/bcache/super.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -1968,6 +1968,8 @@ static ssize_t register_bcache(struct ko
 			else
 				err = "device busy";
 			mutex_unlock(&bch_register_lock);
+			if (!IS_ERR(bdev))
+				bdput(bdev);
 			if (attr == &ksysfs_register_quiet)
 				goto out;
 		}

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

queue-4.9/ext4-fix-quota-inconsistency-during-orphan-cleanup-for-read-only-mounts.patch queue-4.9/bcache-fix-leak-of-bdev-reference.patch queue-4.9/orangefs-don-t-clear-sgid-when-inheriting-acls.patch queue-4.9/ext4-fix-incorrect-quotaoff-if-the-quota-feature-is-enabled.patch