linux-hardening - Re: [PATCH][next] drm/amdgpu: Use struct_size() helper in kmalloc()

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Message-ID: <CADnq5_NA+vck4=zq8LxkrJDx0AXcu8iLAs=TNdvxoWhFqeTfEA@mail.gmail.com>
Date:   Thu, 8 Oct 2020 13:22:51 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-hardening@...r.kernel.org,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] drm/amdgpu: Use struct_size() helper in kmalloc()

Applied.  Thanks!

Alex

On Thu, Oct 8, 2020 at 10:17 AM Gustavo A. R. Silva
<gustavoars@...nel.org> wrote:
>
> Make use of the new struct_size() helper instead of the offsetof() idiom.
>
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>  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;
>
> --
> 2.27.0
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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