netdev - Re: [RFC net-next 2/2] ice: make use of DECLARE_FLEX() in ice

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Date: Tue, 1 Aug 2023 15:35:21 -0700
From: Kees Cook <keescook@...omium.org>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Cc: Jacob Keller <jacob.e.keller@...el.com>,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	Alexander Lobakin <aleksander.lobakin@...el.com>
Subject: Re: [RFC net-next 2/2] ice: make use of DECLARE_FLEX() in
 ice_switch.c

On Tue, Aug 01, 2023 at 01:19:23PM +0200, Przemek Kitszel wrote:
> Use DECLARE_FLEX() macro for 1-elem flex array members of ice_switch.c
> 
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_switch.c | 53 +++++----------------
>  1 file changed, 12 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c
> index a7afb612fe32..41679cb6b548 100644
> --- a/drivers/net/ethernet/intel/ice/ice_switch.c
> +++ b/drivers/net/ethernet/intel/ice/ice_switch.c
> @@ -1812,15 +1812,11 @@ ice_aq_alloc_free_vsi_list(struct ice_hw *hw, u16 *vsi_list_id,
>  			   enum ice_sw_lkup_type lkup_type,
>  			   enum ice_adminq_opc opc)
>  {
> -	struct ice_aqc_alloc_free_res_elem *sw_buf;
> +	DECLARE_FLEX(struct ice_aqc_alloc_free_res_elem *, sw_buf, elem, 1);
> +	u16 buf_len = struct_size(sw_buf, elem, 1);

With the macro I suggested, I think this line can become:

	u16 buf_len = __builtin_object_size(sw_buf, 1);

but either is fine. (N.B. the "1" here is a bitfield, not the "1" size
above).

-Kees

-- 
Kees Cook