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bcache: Fix leak of bdev reference

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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.

Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan Kara 2017-09-06 14:25:51 +08:00 committed by Greg Kroah-Hartman
parent 2a9b55742a
commit c234e0e775
1 changed files with 2 additions and 0 deletions
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2
drivers/md/bcache/super.c
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@ -1968,6 +1968,8 @@ 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;
}