linux-kernel - Re: [PATCH v3 2/2] mac80211: Use flexible array in struct ieee80211_tim

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Message-ID: <202308311218.D82D90A@keescook>
Date:   Thu, 31 Aug 2023 12:18:29 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jeff Johnson <quic_jjohnson@...cinc.com>
Cc:     kernel@...cinc.com, Kalle Valo <kvalo@...nel.org>,
        Toke Høiland-Jørgensen <toke@...e.dk>,
        Christian Lamparter <chunkeey@...glemail.com>,
        Stanislaw Gruszka <stf_xl@...pl>,
        Helmut Schaa <helmut.schaa@...glemail.com>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v3 2/2] mac80211: Use flexible array in struct
 ieee80211_tim_ie

On Thu, Aug 31, 2023 at 11:22:58AM -0700, Jeff Johnson wrote:
> Currently struct ieee80211_tim_ie defines:
> 	u8 virtual_map[1];
> 
> Per the guidance in [1] change this to be a flexible array.
> 
> Per the discussion in [2] wrap the virtual_map in a union with a u8
> item in order to preserve the existing expectation that the
> virtual_map must contain at least one octet (at least when used in a
> non-S1G PPDU). This means that no driver changes are required.
> 
> [1] https://docs.kernel.org/process/deprecated.html#zero-length-and-one-element-arrays
> [2] https://lore.kernel.org/linux-wireless/202308301529.AC90A9EF98@keescook/
> 
> Suggested-by: Kees Cook <keescook@...omium.org>
> Signed-off-by: Jeff Johnson <quic_jjohnson@...cinc.com>

Looks good to me! Thanks for the conversion. :)

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

-- 
Kees Cook