linux-kernel - Re: [PATCH] staging: rtl8192u avoid flex array of flex array

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Date:   Mon, 1 Mar 2021 09:33:12 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "Darryl T. Agostinelli" <dagostinelli@...il.com>
Cc:     devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8192u avoid flex array of flex array

On Sat, Feb 27, 2021 at 07:06:14PM -0600, Darryl T. Agostinelli wrote:
> Undo the flex array in struct ieee80211_info_element.  It is used as the flex
> array type in other structs (creating a flex array of flex arrays) making
> sparse unhappy.  This change maintains the intent of the code and satisfies
> sparse.
> 
> Signed-off-by: Darryl T. Agostinelli <dagostinelli@...il.com>
> ---
>  drivers/staging/rtl8192u/ieee80211/ieee80211.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211.h b/drivers/staging/rtl8192u/ieee80211/ieee80211.h
> index 39f4ddd86796..43bb7aeb35e3 100644
> --- a/drivers/staging/rtl8192u/ieee80211/ieee80211.h
> +++ b/drivers/staging/rtl8192u/ieee80211/ieee80211.h
> @@ -951,7 +951,7 @@ struct rtl_80211_hdr_4addrqos {
>  struct ieee80211_info_element {
>  	u8 id;
>  	u8 len;
> -	u8 data[];
> +	u8 data[0];

Nah...  Just ignore Sparse on this.

regards,
dan carpenter