Commit 5f6c2d2b authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe

blkcg: fix gendisk reference leak in blkg_conf_prep()

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: default avatarTejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 21974061
...@@ -718,8 +718,12 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol, ...@@ -718,8 +718,12 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
return -EINVAL; return -EINVAL;
disk = get_gendisk(MKDEV(major, minor), &part); disk = get_gendisk(MKDEV(major, minor), &part);
if (!disk || part) if (!disk)
return -EINVAL; return -EINVAL;
if (part) {
put_disk(disk);
return -EINVAL;
}
rcu_read_lock(); rcu_read_lock();
spin_lock_irq(disk->queue->queue_lock); spin_lock_irq(disk->queue->queue_lock);
......
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