linux-kernel - Re: [PATCH v2 net] nfc: nci: assert requested protocol is valid

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Message-ID: <ZSbBS74m2PmdSmP2@kernel.org>
Date:   Wed, 11 Oct 2023 17:37:47 +0200
From:   Simon Horman <horms@...nel.org>
To:     Jeremy Cline <jeremy@...ine.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, Lin Ma <linma@....edu.cn>,
        Ilan Elias <ilane@...com>,
        "John W . Linville" <linville@...driver.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzbot+0839b78e119aae1fec78@...kaller.appspotmail.com
Subject: Re: [PATCH v2 net] nfc: nci: assert requested protocol is valid

On Mon, Oct 09, 2023 at 04:00:54PM -0400, Jeremy Cline wrote:
> The protocol is used in a bit mask to determine if the protocol is
> supported. Assert the provided protocol is less than the maximum
> defined so it doesn't potentially perform a shift-out-of-bounds and
> provide a clearer error for undefined protocols vs unsupported ones.
> 
> Fixes: 6a2968aaf50c ("NFC: basic NCI protocol implementation")
> Reported-and-tested-by: syzbot+0839b78e119aae1fec78@...kaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=0839b78e119aae1fec78
> Signed-off-by: Jeremy Cline <jeremy@...ine.org>

As per my review of v1, this looks good to me.

Reviewed-by: Simon Horman <horms@...nel.org>