[PATCH 3.2 026/125] USB: sierra: fix urb and memory leak on disconnect

Ben Hutchings
2014-07-08T19:17:08Z

From: Johan Hovold <jhovold@gmail.com>

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>
[bwh: Backported to 3.2: adjust context, indentation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/usb/serial/sierra.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -802,6 +802,7 @@ static void sierra_close(struct usb_seri
struct usb_serial *serial = port->serial;
struct sierra_port_private *portdata;
struct sierra_intf_private *intfdata = port->serial->private;
+ struct urb *urb;

dev_dbg(&port->dev, "%s\n", __func__);
@@ -826,6 +827,17 @@ static void sierra_close(struct usb_seri
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);
+ }

/* Stop reading urbs */
sierra_stop_rx_urbs(port);