linux-kernel - Re: [PATCH][next] drm/amdgpu: Fix sizeof() mismatch in bps_bo kmalloc

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Message-ID: <88005778-a759-a3c8-a86d-070a51f04dc2@amd.com>
Date:   Wed, 25 Nov 2020 15:19:35 +0100
From:   Christian König <christian.koenig@....com>
To:     Colin King <colin.king@...onical.com>,
        Alex Deucher <alexander.deucher@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Tao Zhou <tao.zhou1@....com>,
        Guchun Chen <guchun.chen@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] drm/amdgpu: Fix sizeof() mismatch in bps_bo
 kmalloc_array creation

Am 25.11.20 um 15:18 schrieb Colin King:
> From: Colin Ian King <colin.king@...onical.com>
>
> An incorrect sizeof() is being used, sizeof((*data)->bps_bo) is not
> correct, it should be sizeof(*(*data)->bps_bo).  It just so happens
> to work because the sizes are the same.  Fix it.
>
> Addresses-Coverity: ("Sizeof not portable (SIZEOF_MISMATCH)")
> Fixes: 5278a159cf35 ("drm/amdgpu: support reserve bad page for virt (v3)")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Acked-by: Christian König <christian.koenig@....com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
> index 2d51b7694d1f..df15d33e3c5c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
> @@ -283,7 +283,7 @@ static int amdgpu_virt_init_ras_err_handler_data(struct amdgpu_device *adev)
>   		return -ENOMEM;
>   
>   	bps = kmalloc_array(align_space, sizeof((*data)->bps), GFP_KERNEL);
> -	bps_bo = kmalloc_array(align_space, sizeof((*data)->bps_bo), GFP_KERNEL);
> +	bps_bo = kmalloc_array(align_space, sizeof(*(*data)->bps_bo), GFP_KERNEL);
>   
>   	if (!bps || !bps_bo) {
>   		kfree(bps);