linux-kernel - Re: [PATCH] spi: sh-sci: fix use-after-free in sh_sci_spi

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Message-ID: <CAMuHMdWVEsn7=Z69xMFb-HZxUbc4iDtUnY7mp1i_tn9k1X_JsA@mail.gmail.com>
Date:	Mon, 16 Jun 2014 18:06:14 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Jürg Billeter <j@...ron.ch>
Cc:	Mark Brown <broonie@...nel.org>,
	linux-spi <linux-spi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Magnus Damm <damm@...nsource.se>
Subject: Re: [PATCH] spi: sh-sci: fix use-after-free in sh_sci_spi_remove()

On Mon, Jun 16, 2014 at 4:39 PM, Jürg Billeter <j@...ron.ch> wrote:
> setbits() uses sp->membase.
>
> Signed-off-by: Jürg Billeter <j@...ron.ch>

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

> ---
>  drivers/spi/spi-sh-sci.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/spi/spi-sh-sci.c b/drivers/spi/spi-sh-sci.c
> index 1f56ef6..b83dd73 100644
> --- a/drivers/spi/spi-sh-sci.c
> +++ b/drivers/spi/spi-sh-sci.c
> @@ -175,9 +175,9 @@ static int sh_sci_spi_remove(struct platform_device *dev)
>  {
>         struct sh_sci_spi *sp = platform_get_drvdata(dev);
>
> -       iounmap(sp->membase);
> -       setbits(sp, PIN_INIT, 0);
>         spi_bitbang_stop(&sp->bitbang);
> +       setbits(sp, PIN_INIT, 0);
> +       iounmap(sp->membase);
>         spi_master_put(sp->bitbang.master);
>         return 0;
>  }
> --
> 2.0.0

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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