linux-kernel - Re: [PATCH] drm/radeon: fix a possible null pointer dereference

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Message-ID: <CADnq5_OzFoCDoOMRURXuh6fT=1KXwg6SGs=p4+jwpUqwimkNiw@mail.gmail.com>
Date:   Thu, 12 Oct 2023 12:26:25 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Ma Ke <make_ruc2021@....com>
Cc:     alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/radeon: fix a possible null pointer dereference

On Tue, Oct 10, 2023 at 9:32 PM Ma Ke <make_ruc2021@....com> wrote:
>
> In radeon_tv_get_modes(), the return value of drm_cvt_mode()
> is assigned to mode, which will lead to a NULL pointer
> dereference on failure of drm_cvt_mode(). Add a check to
> avoid null point dereference.
>
> Signed-off-by: Ma Ke <make_ruc2021@....com>

Applied.  Thanks!

Alex

> ---
>  drivers/gpu/drm/radeon/radeon_connectors.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
> index d2f02c3dfce2..b84b58926106 100644
> --- a/drivers/gpu/drm/radeon/radeon_connectors.c
> +++ b/drivers/gpu/drm/radeon/radeon_connectors.c
> @@ -1119,6 +1119,8 @@ static int radeon_tv_get_modes(struct drm_connector *connector)
>         else {
>                 /* only 800x600 is supported right now on pre-avivo chips */
>                 tv_mode = drm_cvt_mode(dev, 800, 600, 60, false, false, false);
> +               if (!tv_mode)
> +                       return 0;
>                 tv_mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
>                 drm_mode_probed_add(connector, tv_mode);
>         }
> --
> 2.37.2
>