usb: cdc-wdm: resp_count can be 0 even if WDM_READ is set

Do not decrement resp_count if it's already 0.

We set resp_count to 0 when the device is closed. The next open and
read will try to clear the WDM_READ flag if there was leftover data
in the read buffer. This fix is necessary to prevent resubmitting
the read URB in a tight loop because resp_count becomes negative.

The bug can easily be triggered from userspace by not reading all
data in the read buffer, and then closing and reopening the chardev.

Fixes: 8dd5cd5395b9 ("usb: cdc-wdm: avoid hanging on zero length reads")
Cc: <[e-mail]> # 3.13
Signed-off-by: Bjørn Mork <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/class/cdc-wdm.c

···
 	clear_bit(WDM_READ, &desc->flags);
 
 	/* submit read urb only if the device is waiting for it */
-	if (!--desc->resp_count)
+	if (!desc->resp_count || !--desc->resp_count)
 		goto out;
 
 	set_bit(WDM_RESPONDING, &desc->flags);