USB: serial: fix memleak in driver-registration error path

udriver struct allocated by kzalloc() will not be freed
if usb_register() and next calls fail. This patch fixes this
by adding one more step with kfree(udriver) in error path.

Signed-off-by: Alexey Klimov <klimov.linux@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index b1b9bac..d213cf4 100644 (file)
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1433,7 +1433,7 @@ int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[]
 
        rc = usb_register(udriver);
        if (rc)
-               return rc;
+               goto failed_usb_register;
 
        for (sd = serial_drivers; *sd; ++sd) {
                (*sd)->usb_driver = udriver;
@@ -1451,6 +1451,8 @@ int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[]
        while (sd-- > serial_drivers)
                usb_serial_deregister(*sd);
        usb_deregister(udriver);
+failed_usb_register:
+       kfree(udriver);
        return rc;
 }
 EXPORT_SYMBOL_GPL(usb_serial_register_drivers);