linux-kernel - Re: [PATCH][next] drm/vmwgfx: Use struct

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Date:   Mon, 22 Jun 2020 17:50:15 +0200
From:   Roland Scheidegger <sroland@...are.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
CC:     <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH][next] drm/vmwgfx: Use struct_size() helper

I've commited this to our next branch, thanks!
(I'm actually kind of impressed this can be found automatically...)

Roland

Am 17.06.20 um 23:51 schrieb Gustavo A. R. Silva:
> Make use of the struct_size() helper instead of an open-coded version
> in order to avoid any potential type mistakes.
> 
> This code was detected with the help of Coccinelle and, audited and
> fixed manually.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>  drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
> index 126f93c0b0b8..3914bfee0533 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
> @@ -1969,7 +1969,7 @@ static int vmw_surface_dirty_alloc(struct vmw_resource *res)
>  		num_mip = 1;
>  
>  	num_subres = num_layers * num_mip;
> -	dirty_size = sizeof(*dirty) + num_subres * sizeof(dirty->boxes[0]);
> +	dirty_size = struct_size(dirty, boxes, num_subres);
>  	acc_size = ttm_round_pot(dirty_size);
>  	ret = ttm_mem_global_alloc(vmw_mem_glob(res->dev_priv),
>  				   acc_size, &ctx);
>