This is a note to let you know that I've just added the patch titled driver: base: fix UAF when driver_attach failed to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: driver-base-fix-uaf-when-driver_attach-failed.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit deecb71229658fc36f4bdfd9c1550ec92950ea19 Author: Schspa Shi <schspa@xxxxxxxxx> Date: Fri May 13 19:24:44 2022 +0800 driver: base: fix UAF when driver_attach failed [ 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@xxxxxxxxx> Link: https://lore.kernel.org/r/20220513112444.45112-1-schspa@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/base/bus.c b/drivers/base/bus.c index a9c23ecebc7c..df85e928b97f 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -621,7 +621,7 @@ 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); @@ -648,6 +648,8 @@ 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() */