From: Jan Kara <jack@xxxxxxx> 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 <jack@xxxxxxx> Acked-by: Coly Li <colyli@xxxxxxx> Cc: stable@xxxxxxxxxxxxxxx --- 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 8352fad765f6..9a2c190745b6 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; } -- 2.13.5