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Subject[PATCH 3.13.y-ckt 20/60] blkcg: fix gendisk reference leak in blkg_conf_prep()
Date
3.13.11-ckt26 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tejun Heo <tj@kernel.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@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
block/blk-cgroup.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index d8f80e7..a717585 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -703,8 +703,12 @@ 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);
--
1.9.1


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