usb: Fix qcserial memory leak on rmmod

qcprobe function allocates serial->private but this is never freed, this
patch adds a new function qc_release() which frees serial->private, after
calling usb_wwan_release

Signed-off-by: Steven Hardy <shardy@redhat.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/qcserial.c b/drivers/usb/serial/qcserial.c
index 8858201..6e3b933 100644 (file)
--- a/drivers/usb/serial/qcserial.c
+++ b/drivers/usb/serial/qcserial.c
@@ -205,6 +205,18 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
        return retval;
 }
 
+static void qc_release(struct usb_serial *serial)
+{
+       struct usb_wwan_intf_private *priv = usb_get_serial_data(serial);
+
+       dbg("%s", __func__);
+
+       /* Call usb_wwan release & free the private data allocated in qcprobe */
+       usb_wwan_release(serial);
+       usb_set_serial_data(serial, NULL);
+       kfree(priv);
+}
+
 static struct usb_serial_driver qcdevice = {
        .driver = {
                .owner     = THIS_MODULE,
@@ -222,7 +234,7 @@ static struct usb_serial_driver qcdevice = {
        .chars_in_buffer     = usb_wwan_chars_in_buffer,
        .attach              = usb_wwan_startup,
        .disconnect          = usb_wwan_disconnect,
-       .release             = usb_wwan_release,
+       .release             = qc_release,
 #ifdef CONFIG_PM
        .suspend             = usb_wwan_suspend,
        .resume              = usb_wwan_resume,