USB: omninet: fix port-data memory leak

Fix port-data memory leak by replacing attach and release with
port_probe and port_remove.

Since commit 0998d0631001288 (device-core: Ensure drvdata = NULL when no
driver is bound) the port private data is no longer freed at release as
it is no longer accessible.

Compile-only tested.

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

diff --git a/drivers/usb/serial/omninet.c b/drivers/usb/serial/omninet.c
index 6def58b79382f97511929b2c3fc8e386c71ffa51..9ab73d2957746d49292357382f7a081faa25cd55 100644 (file)
--- a/drivers/usb/serial/omninet.c
+++ b/drivers/usb/serial/omninet.c
@@ -44,8 +44,8 @@ static int  omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
                                const unsigned char *buf, int count);
 static int  omninet_write_room(struct tty_struct *tty);
 static void omninet_disconnect(struct usb_serial *serial);
-static void omninet_release(struct usb_serial *serial);
-static int omninet_attach(struct usb_serial *serial);
+static int omninet_port_probe(struct usb_serial_port *port);
+static int omninet_port_remove(struct usb_serial_port *port);
 
 static const struct usb_device_id id_table[] = {
        { USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
@@ -62,7 +62,8 @@ static struct usb_serial_driver zyxel_omninet_device = {
        .description =          "ZyXEL - omni.net lcd plus usb",
        .id_table =             id_table,
        .num_ports =            1,
-       .attach =               omninet_attach,
+       .port_probe =           omninet_port_probe,
+       .port_remove =          omninet_port_remove,
        .open =                 omninet_open,
        .close =                omninet_close,
        .write =                omninet_write,
@@ -70,7 +71,6 @@ static struct usb_serial_driver zyxel_omninet_device = {
        .read_bulk_callback =   omninet_read_bulk_callback,
        .write_bulk_callback =  omninet_write_bulk_callback,
        .disconnect =           omninet_disconnect,
-       .release =              omninet_release,
 };
 
 static struct usb_serial_driver * const serial_drivers[] = {
@@ -112,18 +112,26 @@ struct omninet_data {
        __u8    od_outseq;      /* Sequence number for bulk_out URBs */
 };
 
-static int omninet_attach(struct usb_serial *serial)
+static int omninet_port_probe(struct usb_serial_port *port)
 {
        struct omninet_data *od;
-       struct usb_serial_port *port = serial->port[0];
 
        od = kmalloc(sizeof(struct omninet_data), GFP_KERNEL);
-       if (!od) {
-               dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n",
-                       __func__, sizeof(struct omninet_data));
+       if (!od)
                return -ENOMEM;
-       }
+
        usb_set_serial_port_data(port, od);
+
+       return 0;
+}
+
+static int omninet_port_remove(struct usb_serial_port *port)
+{
+       struct omninet_data *od;
+
+       od = usb_get_serial_port_data(port);
+       kfree(od);
+
        return 0;
 }
 
@@ -279,14 +287,6 @@ static void omninet_disconnect(struct usb_serial *serial)
        usb_kill_urb(wport->write_urb);
 }
 
-
-static void omninet_release(struct usb_serial *serial)
-{
-       struct usb_serial_port *port = serial->port[0];
-
-       kfree(usb_get_serial_port_data(port));
-}
-
 module_usb_serial_driver(serial_drivers, id_table);
 
 MODULE_AUTHOR(DRIVER_AUTHOR);