linux-kernel - [PATCH 5.4 317/411] driver: base: fix UAF when driver

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Date:   Mon, 13 Jun 2022 12:09:50 +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, Schspa Shi <schspa@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 317/411] driver: base: fix UAF when driver_attach failed

From: Schspa Shi <schspa@...il.com>

[ Upstream commit 310862e574001a97ad02272bac0fd13f75f42a27 ]

When driver_attach(drv); failed, the driver_private will be freed.
But it has been added to the bus, which caused a UAF.

To fix it, we need to delete it from the bus when failed.

Fixes: 190888ac01d0 ("driver core: fix possible missing of device probe")
Signed-off-by: Schspa Shi <schspa@...il.com>
Link: https://lore.kernel.org/r/20220513112444.45112-1-schspa@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/base/bus.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index a1d1e8256324..7d7d28f498ed 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -620,7 +620,7 @@ int bus_add_driver(struct device_driver *drv)
 	if (drv->bus->p->drivers_autoprobe) {
 		error = driver_attach(drv);
 		if (error)
-			goto out_unregister;
+			goto out_del_list;
 	}
 	module_add_driver(drv->owner, drv);
 
@@ -647,6 +647,8 @@ int bus_add_driver(struct device_driver *drv)
 
 	return 0;
 
+out_del_list:
+	klist_del(&priv->knode_bus);
 out_unregister:
 	kobject_put(&priv->kobj);
 	/* drv->p is freed in driver_release()  */
-- 
2.35.1