netdev - RE: [PATCH net-next] ice: Fix off by one in ice_tc_forward_to

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Date:   Fri, 28 Oct 2022 21:27:59 +0000
From:   "Nambiar, Amritha" <amritha.nambiar@...el.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>
CC:     "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        "Gomes, Vinicius" <vinicius.gomes@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH net-next] ice: Fix off by one in ice_tc_forward_to_queue()

> -----Original Message-----
> From: Dan Carpenter <dan.carpenter@...cle.com>
> Sent: Friday, October 28, 2022 8:02 AM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nambiar, Amritha
> <amritha.nambiar@...el.com>
> Cc: Nguyen, Anthony L <anthony.l.nguyen@...el.com>; David S. Miller
> <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub
> Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; Samudrala,
> Sridhar <sridhar.samudrala@...el.com>; Gomes, Vinicius
> <vinicius.gomes@...el.com>; intel-wired-lan@...ts.osuosl.org;
> netdev@...r.kernel.org; kernel-janitors@...r.kernel.org
> Subject: [PATCH net-next] ice: Fix off by one in ice_tc_forward_to_queue()
> 
> The > comparison should be >= to prevent reading one element beyond
> the end of the array.
> 
> The "vsi->num_rxq" is not strictly speaking the number of elements in
> the vsi->rxq_map[] array.  The array has "vsi->alloc_rxq" elements and
> "vsi->num_rxq" is less than or equal to the number of elements in the
> array.  The array is allocated in ice_vsi_alloc_arrays().  It's still
> an off by one but it might not access outside the end of the array.
> 
> Fixes: 143b86f346c7 ("ice: Enable RX queue selection using skbedit action")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Acked-by: Amritha Nambiar <amritha.nambiar@...el.com>

> ---
> Applies to net-next.
> 
>  drivers/net/ethernet/intel/ice/ice_tc_lib.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_tc_lib.c
> b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
> index faba0f857cd9..95f392ab9670 100644
> --- a/drivers/net/ethernet/intel/ice/ice_tc_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
> @@ -1681,7 +1681,7 @@ ice_tc_forward_to_queue(struct ice_vsi *vsi, struct
> ice_tc_flower_fltr *fltr,
>  	struct ice_vsi *ch_vsi = NULL;
>  	u16 queue = act->rx_queue;
> 
> -	if (queue > vsi->num_rxq) {
> +	if (queue >= vsi->num_rxq) {
>  		NL_SET_ERR_MSG_MOD(fltr->extack,
>  				   "Unable to add filter because specified
> queue is invalid");
>  		return -EINVAL;
> --
> 2.35.1