linux-kernel - [PATCH 5.4 155/244] vfio/mdev: Do not allow a mdev

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Date:   Wed, 12 May 2021 16:48:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Kevin Tian <kevin.tian@...el.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 155/244] vfio/mdev: Do not allow a mdev_type to have a NULL parent pointer

From: Jason Gunthorpe <jgg@...dia.com>

[ Upstream commit b5a1f8921d5040bb788492bf33a66758021e4be5 ]

There is a small race where the parent is NULL even though the kobj has
already been made visible in sysfs.

For instance the attribute_group is made visible in sysfs_create_files()
and the mdev_type_attr_show() does:

    ret = attr->show(kobj, type->parent->dev, buf);

Which will crash on NULL parent. Move the parent setup to before the type
pointer leaves the stack frame.

Fixes: 7b96953bc640 ("vfio: Mediated device Core driver")
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@...dia.com>
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Message-Id: <2-v2-d36939638fc6+d54-vfio2_jgg@...dia.com>
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/vfio/mdev/mdev_sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index f32c582611eb..ca9476883f15 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -105,6 +105,7 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
 		return ERR_PTR(-ENOMEM);
 
 	type->kobj.kset = parent->mdev_types_kset;
+	type->parent = parent;
 
 	ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
 				   "%s-%s", dev_driver_string(parent->dev),
@@ -132,7 +133,6 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
 	}
 
 	type->group = group;
-	type->parent = parent;
 	return type;
 
 attrs_failed:
-- 
2.30.2