linux-kernel - Re: [PATCH] drm/amdgpu: fix i2s_pdata out of bound array access

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Date:   Wed, 27 Jul 2022 10:55:12 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Vijendar Mukunda <Vijendar.Mukunda@....com>
Cc:     dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        Sunil-kumar.Dommati@....com, David Airlie <airlied@...ux.ie>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        open list <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        dan.carpenter@...cle.com
Subject: Re: [PATCH] drm/amdgpu: fix i2s_pdata out of bound array access

On Wed, Jul 27, 2022 at 10:42 AM Vijendar Mukunda
<Vijendar.Mukunda@....com> wrote:
>
> Fixed following Smatch static checker warning:
>
>     drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c:393 acp_hw_init()
>     error: buffer overflow 'i2s_pdata' 3 <= 3
>     drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c:396 acp_hw_init()
>     error: buffer overflow 'i2s_pdata' 3 <= 3
>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c | 8 --------
>  1 file changed, 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> index bcc7ee02e0fc..6d72355ac492 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> @@ -390,14 +390,6 @@ static int acp_hw_init(void *handle)
>                 i2s_pdata[2].i2s_reg_comp1 = ACP_BT_COMP1_REG_OFFSET;
>                 i2s_pdata[2].i2s_reg_comp2 = ACP_BT_COMP2_REG_OFFSET;
>
> -               i2s_pdata[3].quirks = DW_I2S_QUIRK_COMP_REG_OFFSET;
> -               switch (adev->asic_type) {
> -               case CHIP_STONEY:
> -                       i2s_pdata[3].quirks |= DW_I2S_QUIRK_16BIT_IDX_OVERRIDE;
> -                       break;
> -               default:
> -                       break;
> -               }

Is this actually not used or should we just increase the allocation size?

Alex

>                 adev->acp.acp_res[0].name = "acp2x_dma";
>                 adev->acp.acp_res[0].flags = IORESOURCE_MEM;
>                 adev->acp.acp_res[0].start = acp_base;
> --
> 2.25.1
>