linux-kernel - Re: [PATCH v3] drm/edid: Fix uninitialized variable in drm_cvt

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Date:   Thu, 5 Nov 2020 19:03:03 -0500
From:   Ilia Mirkin <imirkin@...m.mit.edu>
To:     Lyude Paul <lyude@...hat.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        "# 3.9+" <stable@...r.kernel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Kalle Valo <kvalo@...eaurora.org>,
        Kees Cook <keescook@...omium.org>, Chao Yu <chao@...nel.org>,
        Leon Romanovsky <leon@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] drm/edid: Fix uninitialized variable in drm_cvt_modes()

On Thu, Nov 5, 2020 at 6:57 PM Lyude Paul <lyude@...hat.com> wrote:
>
> Noticed this when trying to compile with -Wall on a kernel fork. We potentially
> don't set width here, which causes the compiler to complain about width
> potentially being uninitialized in drm_cvt_modes(). So, let's fix that.
>
> Changes since v1:
> * Don't emit an error as this code isn't reachable, just mark it as such
> Changes since v2:
> * Remove now unused variable
>
> Signed-off-by: Lyude Paul <lyude@...hat.com>
>
> Cc: <stable@...r.kernel.org> # v5.9+
> Fixes: 3f649ab728cd ("treewide: Remove uninitialized_var() usage")
> Signed-off-by: Lyude Paul <lyude@...hat.com>

For the very little it's worth,

Reviewed-by: Ilia Mirkin <imirkin@...m.mit.edu>

> ---
>  drivers/gpu/drm/drm_edid.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 631125b46e04..b84efd538a70 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3114,6 +3114,8 @@ static int drm_cvt_modes(struct drm_connector *connector,
>                 case 0x0c:
>                         width = height * 15 / 9;
>                         break;
> +               default:
> +                       unreachable();
>                 }
>
>                 for (j = 1; j < 5; j++) {
> --
> 2.28.0
>