From: Schspa Shi schspa@gmail.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@gmail.com Link: https://lore.kernel.org/r/20220513112444.45112-1-schspa@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.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 97936ec49bde..7ca47e5b3c1f 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -617,7 +617,7 @@ 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);
@@ -644,6 +644,8 @@ 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() */