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blkcg: fix gendisk reference leak in blkg_conf_prep() 

commit 5f6c2d2b7dbb541c1e922538c49fa04c494ae3d7 upstream.

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>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2015-07-22 18:05:53 -04:00 committed by Greg Kroah-Hartman
parent 15d6dd8f74
commit 74f412afcf
1 changed files with 5 additions and 1 deletions
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6
block/blk-cgroup.c
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@ -720,8 +720,12 @@ 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);