linux-kernel - Re: [PATCH 1/5] gma500: fix a missing break in oaktrail_crtc_mode

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Date:   Fri, 1 Apr 2022 11:25:12 +0200
From:   Patrik Jakobsson <patrik.r.jakobsson@...il.com>
To:     Xiaomeng Tong <xiam0nd.tong@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        "Clark, Rob" <rob@...com>, Zhao Yakui <yakui.zhao@...el.com>,
        Dave Airlie <airlied@...hat.com>,
        Alan Cox <alan@...ux.intel.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] gma500: fix a missing break in oaktrail_crtc_mode_set

On Wed, Mar 30, 2022 at 2:03 PM Xiaomeng Tong <xiam0nd.tong@...il.com> wrote:
>
> Instead of exiting the loop as expected when an entry is found, the
> list_for_each_entry() continues until the traversal is complete. It
> will certainly lead to a invalid reference to list itereator variable
> 'connector' after the loop pointing an bogus address at an offset
> from the list head, and could lead to multiple 'is_*' flags being set
> with true mistakely too.
>
> The invalid reference to list itereator is here:
>         drm_object_property_get_value(&connector->base,
>
> To fix this, when found the entry, add a break after the switch
> statement.

Hi, this is already fixed in:
commit b1a7d0ddb169774c3db5afe9e64124daea7fdd9f
Author: Patrik Jakobsson <patrik.r.jakobsson@...il.com>
Date:   Tue Mar 22 14:17:38 2022 +0100

    drm/gma500: Make use of the drm connector iterator

>
> Fixes: a69ac9ea85d87 ("drm/gma500: drm_connector_property -> drm_object_property")
> Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>
> ---
>  drivers/gpu/drm/gma500/oaktrail_crtc.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/gma500/oaktrail_crtc.c b/drivers/gpu/drm/gma500/oaktrail_crtc.c
> index 36c7c2686c90..eb2d79872bd5 100644
> --- a/drivers/gpu/drm/gma500/oaktrail_crtc.c
> +++ b/drivers/gpu/drm/gma500/oaktrail_crtc.c
> @@ -409,6 +409,8 @@ static int oaktrail_crtc_mode_set(struct drm_crtc *crtc,
>                         is_mipi = true;
>                         break;
>                 }
> +
> +               break;
>         }
>
>         /* Disable the VGA plane that we never use */
> --
> 2.17.1
>