[PATCH v2 2/4] USB: serial: fix dynamic id driver deregistration race

[Johan Hovold <johan@kernel.org>]

Only free the dynamic ids after having deregistered the driver and
removed the "new_id" attribute to avoid leaking any id added by a racing
write to the attribute.

Fixes: 93bacefc4cc0 ("USB serial: add dynamic id support to usb-serial core")
Cc: stable@vger.kernel.org	# 2.6.21
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/serial/bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/serial/bus.c b/drivers/usb/serial/bus.c
index 9e2a18c0b218..295c61afa44c 100644
--- a/drivers/usb/serial/bus.c
+++ b/drivers/usb/serial/bus.c
@@ -165,7 +165,7 @@ int usb_serial_bus_register(struct usb_serial_driver *driver)
 
 void usb_serial_bus_deregister(struct usb_serial_driver *driver)
 {
-	free_dynids(driver);
 	driver_unregister(&driver->driver);
+	free_dynids(driver);
 }
 
-- 
2.54.0