USB: f81232: 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>

1 files changed, 17 insertions, 26 deletions

diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 244477107e2f..6e4eb57d0177 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -318,39 +318,30 @@ static int f81232_ioctl(struct tty_struct *tty,
         return -ENOIOCTLCMD;
 }
 
-static int f81232_startup(struct usb_serial *serial)
+static int f81232_port_probe(struct usb_serial_port *port)
 {
         struct f81232_private *priv;
-        int i;
 
-        for (i = 0; i < serial->num_ports; ++i) {
-                priv = kzalloc(sizeof(struct f81232_private), GFP_KERNEL);
-                if (!priv)
-                        goto cleanup;
-                spin_lock_init(&priv->lock);
-                init_waitqueue_head(&priv->delta_msr_wait);
-                usb_set_serial_port_data(serial->port[i], priv);
-        }
-        return 0;
+        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
 
-cleanup:
-        for (--i; i >= 0; --i) {
-                priv = usb_get_serial_port_data(serial->port[i]);
-                kfree(priv);
-                usb_set_serial_port_data(serial->port[i], NULL);
-        }
-        return -ENOMEM;
+        spin_lock_init(&priv->lock);
+        init_waitqueue_head(&priv->delta_msr_wait);
+
+        usb_set_serial_port_data(port, priv);
+
+        return 0;
 }
 
-static void f81232_release(struct usb_serial *serial)
+static int f81232_port_remove(struct usb_serial_port *port)
 {
-        int i;
         struct f81232_private *priv;
 
-        for (i = 0; i < serial->num_ports; ++i) {
-                priv = usb_get_serial_port_data(serial->port[i]);
-                kfree(priv);
-        }
+        priv = usb_get_serial_port_data(port);
+        kfree(priv);
+
+        return 0;
 }
 
 static struct usb_serial_driver f81232_device = {
@@ -373,8 +364,8 @@ static struct usb_serial_driver f81232_device = {
         .tiocmset =             f81232_tiocmset,
         .process_read_urb =     f81232_process_read_urb,
         .read_int_callback =    f81232_read_int_callback,
-        .attach =               f81232_startup,
-        .release =              f81232_release,
+        .port_probe =           f81232_port_probe,
+        .port_remove =          f81232_port_remove,
 };
 
 static struct usb_serial_driver * const serial_drivers[] = {