USB: option: fix interface-data memory leak in error path

Move interface data allocation to attach so that it is deallocated
should usb-serial probe fail.

Note that the usb device id is stored at probe so that it can be used
in attach to determine send-setup blacklisting.

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

1 files changed, 19 insertions, 2 deletions

diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index eb4bdd4a0106..5dee7d61241e 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -47,6 +47,7 @@
 /* Function prototypes */
 static int  option_probe(struct usb_serial *serial,
                         const struct usb_device_id *id);
+static int option_attach(struct usb_serial *serial);
 static void option_release(struct usb_serial *serial);
 static int option_send_setup(struct usb_serial_port *port);
 static void option_instat_callback(struct urb *urb);
@@ -1288,6 +1289,7 @@ static struct usb_serial_driver option_1port_device = {
         .tiocmget          = usb_wwan_tiocmget,
         .tiocmset          = usb_wwan_tiocmset,
         .ioctl             = usb_wwan_ioctl,
+        .attach            = option_attach,
         .release           = option_release,
         .port_probe        = usb_wwan_port_probe,
         .port_remove       = usb_wwan_port_remove,
@@ -1335,8 +1337,6 @@ static bool is_blacklisted(const u8 ifnum, enum option_blacklist_reason reason,
 static int option_probe(struct usb_serial *serial,
                         const struct usb_device_id *id)
 {
-        struct usb_wwan_intf_private *data;
-        struct option_private *priv;
         struct usb_interface_descriptor *iface_desc =
                                 &serial->interface->cur_altsetting->desc;
         struct usb_device_descriptor *dev_desc = &serial->dev->descriptor;
@@ -1374,6 +1374,19 @@ static int option_probe(struct usb_serial *serial,
                 iface_desc->bInterfaceClass != USB_CLASS_CDC_DATA)
                 return -ENODEV;
 
+        /* Store device id so we can use it during attach. */
+        usb_set_serial_data(serial, (void *)id);
+
+        return 0;
+}
+
+static int option_attach(struct usb_serial *serial)
+{
+        struct usb_interface_descriptor *iface_desc;
+        const struct usb_device_id *id;
+        struct usb_wwan_intf_private *data;
+        struct option_private *priv;
+
         data = kzalloc(sizeof(struct usb_wwan_intf_private), GFP_KERNEL);
         if (!data)
                 return -ENOMEM;
@@ -1384,6 +1397,10 @@ static int option_probe(struct usb_serial *serial,
                 return -ENOMEM;
         }
 
+        /* Retrieve device id stored at probe. */
+        id = usb_get_serial_data(serial);
+        iface_desc = &serial->interface->cur_altsetting->desc;
+
         priv->bInterfaceNumber = iface_desc->bInterfaceNumber;
         data->private = priv;