linux-kernel - Re: [PATCH] drivers: gpu: drm: radeon: possible buffer overflow

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Date:   Fri, 18 Aug 2023 12:16:59 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Cc:     alexander.deucher@....com, artem.kuzin@...wei.com,
        Xinhui.Pan@....com, linux-kernel@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        yusongping@...wei.com, christian.koenig@....com
Subject: Re: [PATCH] drivers: gpu: drm: radeon: possible buffer overflow

Applied.  Thanks!

On Thu, Aug 17, 2023 at 7:34 AM Konstantin Meskhidze
<konstantin.meskhidze@...wei.com> wrote:
>
> Buffer 'afmt_status' of size 6 could overflow, since index 'afmt_idx' is
> checked after access.
>
> Fixes: 5cc4e5fc293b ("drm/radeon: Cleanup HDMI audio interrupt handling for evergreen")
> Co-developed-by: Ivanov Mikhail <ivanov.mikhail1@...wei-partners.com>
> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
> ---
>  drivers/gpu/drm/radeon/evergreen.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
> index 4f06356d9..f0ae087be 100644
> --- a/drivers/gpu/drm/radeon/evergreen.c
> +++ b/drivers/gpu/drm/radeon/evergreen.c
> @@ -4821,14 +4821,15 @@ int evergreen_irq_process(struct radeon_device *rdev)
>                         break;
>                 case 44: /* hdmi */
>                         afmt_idx = src_data;
> -                       if (!(afmt_status[afmt_idx] & AFMT_AZ_FORMAT_WTRIG))
> -                               DRM_DEBUG("IH: IH event w/o asserted irq bit?\n");
> -
>                         if (afmt_idx > 5) {
>                                 DRM_ERROR("Unhandled interrupt: %d %d\n",
>                                           src_id, src_data);
>                                 break;
>                         }
> +
> +                       if (!(afmt_status[afmt_idx] & AFMT_AZ_FORMAT_WTRIG))
> +                               DRM_DEBUG("IH: IH event w/o asserted irq bit?\n");
> +
>                         afmt_status[afmt_idx] &= ~AFMT_AZ_FORMAT_WTRIG;
>                         queue_hdmi = true;
>                         DRM_DEBUG("IH: HDMI%d\n", afmt_idx + 1);
> --
> 2.34.1
>