[PATCH 5.15 793/917] block: fix device_add_disk() kobject_create_and_add() error handling

Greg Kroah-Hartman
2021-11-16T00:36:35Z

From: Luis Chamberlain <mcgrof@kernel.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@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211103164023.1384821-1-mcgrof@kernel.org
[axboe: fold in followup fix from Wu Bo <wubo40@huawei.com>]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.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