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Date: Sat, 8 Aug 2015 15:07:39 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Tejun Heo <tj@...nel.org>,
Jens Axboe <axboe@...com>
Subject: [PATCH 3.14 16/29] blkcg: fix gendisk reference leak in blkg_conf_prep()
3.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tejun Heo <tj@...nel.org>
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@...nel.org>
Signed-off-by: Jens Axboe <axboe@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
block/blk-cgroup.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -703,8 +703,12 @@ int blkg_conf_prep(struct blkcg *blkcg,
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);
--
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