On Wed, Jun 27, 2012 at 03:59:16PM +0200, Marek Vasut wrote:
> Dear Dan Carpenter,
>
> > On Wed, Jun 27, 2012 at 03:32:12PM +0200, Marek Vasut wrote:
> > > Dear Dan Carpenter,
> > >
> > > > Hello Marek Vasut,
> > > >
> > > > The patch 6ae3a0876185: "ACER: Add support for accelerometer sensor"
> > > > from Jun 1, 2012, leads to the following Smatch warning:
> > > > drivers/platform/x86/acer-wmi.c:1886 acer_wmi_accel_destroy()
> > > >
> > > > error: don't call input_free_device() after
> > > > input_unregister_device()
> > > >
> > > > drivers/platform/x86/acer-wmi.c
> > > >
> > > > 1883 static void acer_wmi_accel_destroy(void)
> > > > 1884 {
> > > > 1885 input_unregister_device(acer_wmi_accel_dev);
> > > > 1886 input_free_device(acer_wmi_accel_dev);
> > > > 1887 }
> > > >
> > > > It is a double free.
> > >
> > > I see, understood ... shall I submit subsequent patch?
> >
> > Yes, please. Could you give me a:
> >
> > Reported-by: Dan Carpenter <[email protected]>
>
> Looking through input_unregister_device(), that call doesn't free the
> structure.
> Actually, many drivers call explicitly kfree() on it.
>
> Where do you see the double_free() ?
>
It's been a while since I looked at this code...
This is described in the comments for input_unregister_device().
It's a refcounted thing. It is freed when the last reference is
dropped.
regards,
dan carpenter
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