linux-kernel - [PATCH v2 10/10] block: put_device() if device

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Date:   Sun, 19 Apr 2020 19:45:29 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     axboe@...nel.dk, viro@...iv.linux.org.uk, bvanassche@....org,
        gregkh@...uxfoundation.org, rostedt@...dmis.org, mingo@...hat.com,
        jack@...e.cz, ming.lei@...hat.com, nstange@...e.de,
        akpm@...ux-foundation.org
Cc:     mhocko@...e.com, yukuai3@...wei.com, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH v2 10/10] block: put_device() if device_add() fails

Through code inspection I've found that we don't put_device() if
device_add() fails, and this must be done to decrement its refcount.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 block/genhd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/block/genhd.c b/block/genhd.c
index 06b642b23a07..c52095a74792 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -721,8 +721,10 @@ static void register_disk(struct device *parent, struct gendisk *disk,
 		WARN_ON(ddev->groups);
 		ddev->groups = groups;
 	}
-	if (device_add(ddev))
+	if (device_add(ddev)) {
+		put_device(ddev);
 		return;
+	}
 	if (!sysfs_deprecated) {
 		err = sysfs_create_link(block_depr, &ddev->kobj,
 					kobject_name(&ddev->kobj));
-- 
2.25.1