[PATCH 4.4 59/66] bcache: Fix leak of bdev reference

Greg Kroah-Hartman
2017-09-24T21:22:34Z

From: Jan Kara <jack@suse.cz>

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>

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

--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1960,6 +1960,8 @@ 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;
}