linux-kernel - Re: [PATCH] media: rcar_drif: fix a memory disclosure

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Date:   Mon, 21 Oct 2019 09:48:31 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Kangjie Lu <kjlu@....edu>
Cc:     Ramesh Shanmugasundaram <rashanmu@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: rcar_drif: fix a memory disclosure

Hi Kangjie,

On Sat, Oct 19, 2019 at 12:29 AM Kangjie Lu <kjlu@....edu> wrote:
> "f->fmt.sdr.reserved" is uninitialized. As other peer drivers
> like msi2500 and airspy do, the fix initializes it to avoid
> memory disclosures.
>
> Signed-off-by: Kangjie Lu <kjlu@....edu>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

> --- a/drivers/media/platform/rcar_drif.c
> +++ b/drivers/media/platform/rcar_drif.c
> @@ -912,6 +912,7 @@ static int rcar_drif_g_fmt_sdr_cap(struct file *file, void *priv,
>  {
>         struct rcar_drif_sdr *sdr = video_drvdata(file);
>
> +       memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
>         f->fmt.sdr.pixelformat = sdr->fmt->pixelformat;
>         f->fmt.sdr.buffersize = sdr->fmt->buffersize;

I would do the memset() at the end, though, to follow declaration order of the
struct members.

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