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

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Message-ID: <CADnq5_P4i2J2AaO2R6rMO0nvRGZNT1EUN1jDUB2mC4BkHKOecg@mail.gmail.com>
Date:   Fri, 13 Oct 2023 09:43:05 -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,
        guchun.chen@....com, yifan1.zhang@....com, Tim.Huang@....com,
        zackr@...are.com, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amdgpu/vkms: fix a possible null pointer dereference

On Thu, Oct 12, 2023 at 10:32 PM Ma Ke <make_ruc2021@....com> wrote:
>
> In amdgpu_vkms_conn_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 pointer
> dereference.
>
> Signed-off-by: Ma Ke <make_ruc2021@....com>

Applied.  Thanks!

Alex

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
> index 7148a216ae2f..db6fc0cb18eb 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
> @@ -239,6 +239,8 @@ static int amdgpu_vkms_conn_get_modes(struct drm_connector *connector)
>
>         for (i = 0; i < ARRAY_SIZE(common_modes); i++) {
>                 mode = drm_cvt_mode(dev, common_modes[i].w, common_modes[i].h, 60, false, false, false);
> +               if (!mode)
> +                       continue;
>                 drm_mode_probed_add(connector, mode);
>         }
>
> --
> 2.37.2
>