linux-kernel - Re: [RFC v1 0/3] Address potential user-after-free on module unload

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Message-ID: <CANiq72kw1=XhGhy8Ac2R9y3ws_jjo0YogoQ5D=tO+7oat=8swA@mail.gmail.com>
Date:   Fri, 8 Feb 2019 05:30:18 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [RFC v1 0/3] Address potential user-after-free on module unload

On Thu, Feb 7, 2019 at 11:33 PM Sven Van Asbroeck <thesven73@...il.com> wrote:
>
> On Thu, Feb 7, 2019 at 5:21 PM Dmitry Torokhov
> <dmitry.torokhov@...il.com> wrote:
> >
> > > ./drivers//input/keyboard/matrix_keypad.c:512:1-18: missing clean-up
> > > of INIT_WORK/INIT_DELAYED_WORK initialized here
> >
> > This is not as simple.
> >
>
> PS If you change
> flush_work(&keypad->work.work);
> to
> flush_delayed_work(&keypad->work);
>
> then the Coccinelle script works correctly, and does not flag
> this driver.

Similarly, in drivers/auxdisplay/ht16k33.c, the cancel_delayed_work()
is there, instead of cancel_delayed_work_sync(). Having the script
suggest this change would be useful, too (i.e. instead of the devm_
change, assuming the cancel_delayed_work() is already there).

Thanks!
Miguel