blkcg: fix gendisk reference leak in blkg_conf_prep()
authorTejun Heo <tj@kernel.org>
Wed, 22 Jul 2015 22:05:53 +0000 (18:05 -0400)
committerJens Axboe <axboe@fb.com>
Wed, 22 Jul 2015 22:06:53 +0000 (16:06 -0600)
When a blkcg configuration is targeted to a partition rather than a
whole device, blkg_conf_prep fails with -EINVAL; unfortunately, it
forgets to put the gendisk ref in that case.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
block/blk-cgroup.c

index 9da02c0..d6283b3 100644 (file)
@@ -718,8 +718,12 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
                return -EINVAL;
 
        disk = get_gendisk(MKDEV(major, minor), &part);
-       if (!disk || part)
+       if (!disk)
                return -EINVAL;
+       if (part) {
+               put_disk(disk);
+               return -EINVAL;
+       }
 
        rcu_read_lock();
        spin_lock_irq(disk->queue->queue_lock);