linux-kernel - [PATCH 5.15 793/917] block: fix device_add_disk() kobject_create_and

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Date:   Mon, 15 Nov 2021 18:04:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 793/917] block: fix device_add_disk() kobject_create_and_add() error handling

From: Luis Chamberlain <mcgrof@...nel.org>

[ Upstream commit fe7d064fa3faec5d8157029fb8720b4fddc9e1e8 ]

Commit 83cbce957446 ("block: add error handling for device_add_disk /
add_disk") added error handling to device_add_disk(), however the goto
label for the kobject_create_and_add() failure did not set the return
value correctly, and so we can end up in a situation where
kobject_create_and_add() fails but we report success.

Fixes: 83cbce957446 ("block: add error handling for device_add_disk / add_disk")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
Reviewed-by: Christoph Hellwig <hch@....de>
Link: https://lore.kernel.org/r/20211103164023.1384821-1-mcgrof@kernel.org
[axboe: fold in followup fix from Wu Bo <wubo40@...wei.com>]
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 block/genhd.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index ab12ae6e636e8..6accd0b185e9e 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -467,11 +467,15 @@ int device_add_disk(struct device *parent, struct gendisk *disk,
 
 	disk->part0->bd_holder_dir =
 		kobject_create_and_add("holders", &ddev->kobj);
-	if (!disk->part0->bd_holder_dir)
+	if (!disk->part0->bd_holder_dir) {
+		ret = -ENOMEM;
 		goto out_del_integrity;
+	}
 	disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
-	if (!disk->slave_dir)
+	if (!disk->slave_dir) {
+		ret = -ENOMEM;
 		goto out_put_holder_dir;
+	}
 
 	ret = bd_register_pending_holders(disk);
 	if (ret < 0)
-- 
2.33.0