USB: sierra: fix urb and memory leak on disconnect

commit 014333f77c0b71123d6ef7d31a9724e0699c9548 upstream.

The delayed-write queue was never emptied on disconnect, something which
would lead to leaked urbs and transfer buffers if the device is
disconnected before being runtime resumed due to a write.

Fixes: e6929a9020ac ("USB: support for autosuspend in sierra while
online")

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index dd9820d..1a42649 100644 (file)
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -759,6 +759,7 @@ static void sierra_close(struct usb_serial_port *port)
        struct usb_serial *serial = port->serial;
        struct sierra_port_private *portdata;
        struct sierra_intf_private *intfdata = port->serial->private;
+       struct urb *urb;
 
        portdata = usb_get_serial_port_data(port);
 
@@ -780,6 +781,18 @@ static void sierra_close(struct usb_serial_port *port)
        portdata->opened = 0;
        spin_unlock_irq(&intfdata->susp_lock);
 
+       for (;;) {
+               urb = usb_get_from_anchor(&portdata->delayed);
+               if (!urb)
+                       break;
+               kfree(urb->transfer_buffer);
+               usb_free_urb(urb);
+               usb_autopm_put_interface_async(serial->interface);
+               spin_lock(&portdata->lock);
+               portdata->outstanding_urbs--;
+               spin_unlock(&portdata->lock);
+       }
+
        sierra_stop_rx_urbs(port);
        for (i = 0; i < portdata->num_in_urbs; i++) {
                sierra_release_urb(portdata->in_urbs[i]);