linux-kernel - [PATCH] octeontx2-af: Add array index check

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Date: Thu, 28 Mar 2024 10:09:37 +0000
From: Hariprasad Kelam <hkelam@...vell.com>
To: Aleksandr Mishin <amishin@...rgos.ru>,
        Sunil Kovvuri Goutham
	<sgoutham@...vell.com>
CC: Linu Cherian <lcherian@...vell.com>,
        Geethasowjanya Akula
	<gakula@...vell.com>,
        Jerin Jacob <jerinj@...vell.com>,
        Subbaraya Sundeep
 Bhatta <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" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lvc-project@...uxtesting.org" <lvc-project@...uxtesting.org>
Subject: [PATCH] octeontx2-af: Add array index check


Hi,

> In rvu_map_cgx_lmac_pf() the 'iter', which is used as an array index, can
> reach value (up to 14) that exceed the size (MAX_LMAC_COUNT = 8) of the
> array.
> Fix this bug by adding 'iter' value check.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 

Since it is a fix, please add "net" to the subject.

Thanks,
Hariprasad k
> Fixes: 91c6945ea1f9 ("octeontx2-af: cn10k: Add RPM MAC support")
> Signed-off-by: Aleksandr Mishin <amishin@...rgos.ru>
> ---
>  drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
> b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
> index 72e060cf6b61..e9bf9231b018 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
> @@ -160,6 +160,8 @@ static int rvu_map_cgx_lmac_pf(struct rvu *rvu)
>  			continue;
>  		lmac_bmap = cgx_get_lmac_bmap(rvu_cgx_pdata(cgx, rvu));
>  		for_each_set_bit(iter, &lmac_bmap, rvu->hw->lmac_per_cgx)
> {
> +			if (iter >= MAX_LMAC_COUNT)
> +				continue;
>  			lmac = cgx_get_lmacid(rvu_cgx_pdata(cgx, rvu),
>  					      iter);
>  			rvu->pf2cgxlmac_map[pf] = cgxlmac_id_to_bmap(cgx,
> lmac);
> --
> 2.30.2