can: gs_usb: gs_usb_receive_bulk_callback(): fix URB memory leak

In the Linux kernel, the following vulnerability has been resolved:

can: gs_usb: gs_usb_receive_bulk_callback(): fix URB memory leak

In gs_can_open(), the URBs for USB-in transfers are allocated, added to the

parent->rx_submitted anchor and submitted. In the complete callback

gs_usb_receive_bulk_callback(), the URB is processed and resubmitted. In

gs_can_close() the URBs are freed by calling

usb_kill_anchored_urbs(parent->rx_submitted).

However, this does not take into account that the USB framework unanchors

the URB before the complete function is called. This means that once an

in-URB has been completed, it is no longer anchored and is ultimately not

released in gs_can_close().

Fix the memory leak by anchoring the URB in the

gs_usb_receive_bulk_callback() to the parent->rx_submitted anchor.