linux-hardening - Re: [PATCH][next] drm/amdgpu: Use struct

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Date:   Fri, 9 Oct 2020 09:07:31 +0200
From:   Christian König <christian.koenig@....com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] drm/amdgpu: Use struct_size() helper in kmalloc()

Am 08.10.20 um 16:23 schrieb Gustavo A. R. Silva:
> Make use of the new struct_size() helper instead of the offsetof() idiom.
>
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

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

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> index 5da487b64a66..30192dce7775 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -239,8 +239,7 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
>   	if (!old)
>   		return 0;
>   
> -	new = kmalloc(offsetof(typeof(*new), shared[old->shared_max]),
> -		      GFP_KERNEL);
> +	new = kmalloc(struct_size(new, shared, old->shared_max), GFP_KERNEL);
>   	if (!new)
>   		return -ENOMEM;
>