[PATCH 01/19] bcache: Fix leak of bdev reference

[Jan Kara]

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.

Signed-off-by: Jan Kara <j...@suse.cz>
Cc: sta...@vger.kernel.org
---
 drivers/md/bcache/super.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 8352fad..9a2c190 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1964,6 +1964,8 @@ static ssize_t register_bcache(struct kobject *k, struct 
kobj_attribute *attr,
                        else
                                err = "device busy";
                        mutex_unlock(&bch_register_lock);
+                       if (!IS_ERR(bdev))
+                               bdput(bdev);
                        if (attr == &ksysfs_register_quiet)
                                goto out;
                }
-- 
1.8.3.1