USB: serial: mos7720: fix use-after-free on probe errors

The interrupt URB was submitted on probe but never stopped on probe
errors. This can lead to use-after-free issues in the completion
handler when accessing the freed usb-serial struct:

Unable to handle kernel paging request at virtual address 6b6b6be7
...
[<bf052e70>] (mos7715_interrupt_callback [mos7720]) from [<c052a894>] (__usb_hcd_giveback_urb+0x80/0x140)
[<c052a894>] (__usb_hcd_giveback_urb) from [<c052a9a4>] (usb_hcd_giveback_urb+0x50/0x138)
[<c052a9a4>] (usb_hcd_giveback_urb) from [<c0550684>] (musb_giveback+0xc8/0x1cc)

Fixes: b69578df7e98 ("USB: usbserial: mos7720: add support for parallel
port on moschip 7715")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 3220d0bc767b2b394e83d29ed3b78aa9d9f8903b..9170ae856b3449af1bc6317bcdca885188479197 100644 (file)
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -1962,8 +1962,10 @@ static int mos7720_startup(struct usb_serial *serial)
 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
        if (product == MOSCHIP_DEVICE_ID_7715) {
                ret_val = mos7715_parport_init(serial);
-               if (ret_val < 0)
+               if (ret_val < 0) {
+                       usb_kill_urb(serial->port[0]->interrupt_in_urb);
                        return ret_val;
+               }
        }
 #endif
        /* LSR For Port 1 */
@@ -1975,6 +1977,8 @@ static int mos7720_startup(struct usb_serial *serial)
 
 static void mos7720_release(struct usb_serial *serial)
 {
+       usb_kill_urb(serial->port[0]->interrupt_in_urb);
+
 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
        /* close the parallel port */