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

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Message-ID: <20231124175830.GV50352@kernel.org>
Date:   Fri, 24 Nov 2023 17:58:30 +0000
From:   Simon Horman <horms@...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>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] octeontx2-af: Fix possible buffer overflow

On Thu, Nov 23, 2023 at 08:36:30PM +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>

Thanks Elena,

I agree with your analysis and that this seems to be
an appropriate fix for the problem.

As this is a fix, it should be targeted at the net, as opposed to net-next,
tree.  Please keep this in mind for future patch submissions.

	Subject: [PATCH net] ...

Link https://docs.kernel.org/process/maintainer-netdev.html

The above nit notwithstanding,

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