linux-kernel - Re: [PATCH net] octeontx2-af: Fix possible buffer overflow

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Date:   Mon, 27 Nov 2023 18:31:22 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Elena Salomatkina <elena.salomatkina.cmc@...il.com>
Cc:     Sunil Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Geetha sowjanya <gakula@...vell.com>,
        Jerin Jacob <jerinj@...vell.com>,
        hariprasad <hkelam@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org,
        Simon Horman <horms@...nel.org>
Subject: Re: [PATCH net] octeontx2-af: Fix possible buffer overflow

On Sat, 25 Nov 2023 00:08:02 +0300 Elena Salomatkina wrote:
> A loop in rvu_mbox_handler_nix_bandprof_free() contains
> a break if (idx == MAX_BANDPROF_PER_PFFUNC),
> but if idx may reach MAX_BANDPROF_PER_PFFUNC
> buffer '(*req->prof_idx)[layer]' overflow happens before that check.
> 
> The patch moves the break to the
> beginning of the loop.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: e8e095b3b370 ("octeontx2-af: cn10k: Bandwidth profiles config support").
> Signed-off-by: Elena Salomatkina <elena.salomatkina.cmc@...il.com>
> Reviewed-by: Simon Horman <horms@...nel.org>

Marvell folks, at least one of you has to review this. Please see:
https://docs.kernel.org/next/maintainer/feature-and-driver-maintainers.html