[PATCH 3.12 136/181] USB: sierra: fix urb and memory leak on disconnect

Jiri Slaby
2014-06-30T12:41:39Z

From: Johan Hovold <jhovold@gmail.com>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

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: Jiri Slaby <jslaby@suse.cz>
---
drivers/usb/serial/sierra.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 5f7f64f70044..0988887e2059 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -767,6 +767,7 @@ 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);

@@ -788,6 +789,18 @@ 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]);
--
2.0.0