Re: [patch 2/2] staging: line6: use after free bug requesting version

[Dan Carpenter <dan.carpenter@oracle.com>]

On Thu, Dec 06, 2012 at 06:18:02AM +0100, Stefan Hajnoczi wrote:
> On Wed, Dec 5, 2012 at 7:44 PM, Dan Carpenter <dan.carpenter@oracle.com> wrote:
> > diff --git a/drivers/staging/line6/driver.c b/drivers/staging/line6/driver.c
> > index 8a5d89e..884e0d8 100644
> > --- a/drivers/staging/line6/driver.c
> > +++ b/drivers/staging/line6/driver.c
> > @@ -110,7 +110,7 @@ struct message {
> >  */
> >  static void line6_data_received(struct urb *urb);
> >  static int line6_send_raw_message_async_part(struct message *msg,
> > -                                            struct urb *urb);
> > +                                            struct urb *urb, int free);
> 
> s/int/bool/
> 
> >
> >  /*
> >         Start to listen on endpoint.
> > @@ -219,24 +219,42 @@ static void line6_async_request_sent(struct urb *urb)
> >                 usb_free_urb(urb);
> >                 kfree(msg);
> >         } else
> > -               line6_send_raw_message_async_part(msg, urb);
> > +               line6_send_raw_message_async_part(msg, urb, 0);
> > +}
> 
> I'd add a bool free_buffer field to struct message and simply modify
> line6_async_request_sent() to do:
> 
> if (msg->free_buffer)
>          kfree(msg->buffer);
> 
> Then you don't need line6_async_request_sent_free_buffer() and
> line6_send_raw_message_async_part() doesn't need to take a bool free
> argument since struct message already contains that information.  It
> would make the code simpler.

Yeah.  That's true.  I'll redo it.

regards,
dan carpenter