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>
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@ -720,8 +720,12 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
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return -EINVAL;
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disk = get_gendisk(MKDEV(major, minor), &part);
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if (!disk || part)
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if (!disk)
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return -EINVAL;
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if (part) {
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put_disk(disk);
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return -EINVAL;
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}
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rcu_read_lock();
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spin_lock_irq(disk->queue->queue_lock);
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