linux-kernel - Re: [PATCH 2/2][next] wifi: brcmfmac: Use struct_size() in code ralated to struct brcmf_dload_data

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Date:   Wed, 16 Nov 2022 14:23:52 -0800
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Hante Meuleman <hante.meuleman@...adcom.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Arend van Spriel <aspriel@...il.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        SHA-cyfmac-dev-list@...ineon.com,
        brcm80211-dev-list.pdl@...adcom.com, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 2/2][next] wifi: brcmfmac: Use struct_size() in code
 ralated to struct brcmf_dload_data_le

On Tue, Nov 15, 2022 at 03:55:34PM -0600, Gustavo A. R. Silva wrote:
> Prefer struct_size() over open-coded versions of idiom:
> 
> sizeof(struct-with-flex-array) + sizeof(typeof-flex-array-elements) * count
> 
> where count is the max number of items the flexible array is supposed to
> contain.
> 
> In this particular case, in the open-coded version sizeof(typeof-flex-array-elements)
> is implicit in _count_ because the type of the flex array data is u8:
> 
> drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h:941:
>  941 struct brcmf_dload_data_le {
>  942         __le16 flag;
>  943         __le16 dload_type;
>  944         __le32 len;
>  945         __le32 crc;
>  946         u8 data[];
>  947 };
> 
> Link: https://github.com/KSPP/linux/issues/160
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook