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

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Date:   Wed, 27 Jul 2022 20:50:17 +0530
From:   "Mukunda,Vijendar" <vijendar.mukunda@....com>
To:     Alex Deucher <alexdeucher@...il.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 7/27/22 8:25 PM, Alex Deucher wrote:
> 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
it's my bad. i2s_pdata array size is 3. when we recently included code
changes for JD platform , this piece of code was added mistakenly for
Stoney platform switch case.

--
Vijendar

> 
>>                 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
>>