netdev - Re: [patch net-next] sfc: a couple off by one bugs

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Message-ID: <60d163b6-0b49-172f-288c-e1712e04a84e@solarflare.com>
Date:   Wed, 1 Feb 2017 13:24:26 +0000
From:   Edward Cree <ecree@...arflare.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Solarflare linux maintainers <linux-net-drivers@...arflare.com>
CC:     Bert Kenward <bkenward@...arflare.com>, <netdev@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: Re: [patch net-next] sfc: a couple off by one bugs

On 01/02/17 08:50, Dan Carpenter wrote:
> These checks are off by one.  These are just sanity checks and we don't
> ever pass invalid values for "encap_type" so it's harmless.
>
> Fixes: 9b4108012517 ("sfc: insert catch-all filters for encapsulated traffic")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
One of these was already fixed by Colin Ian King in
e9904990e8e70a51574e6ec6b872f3c705ec75f0 ("sfc: fix an off-by-one compare on an
array size").
For the other one:
Acked-by: Edward Cree <ecree@...arflare.com>
> diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
> index 8bec9383d754..dec0c8083ff3 100644
> --- a/drivers/net/ethernet/sfc/ef10.c
> +++ b/drivers/net/ethernet/sfc/ef10.c
> @@ -5080,7 +5080,7 @@ static int efx_ef10_filter_insert_def(struct efx_nic *efx,
>  
>  		/* quick bounds check (BCAST result impossible) */
>  		BUILD_BUG_ON(EFX_EF10_BCAST != 0);
> -		if (encap_type > ARRAY_SIZE(map) || map[encap_type] == 0) {
> +		if (encap_type >= ARRAY_SIZE(map) || map[encap_type] == 0) {
>  			WARN_ON(1);
>  			return -EINVAL;
>  		}
> @@ -5134,7 +5134,7 @@ static int efx_ef10_filter_insert_def(struct efx_nic *efx,
>  
>  		/* quick bounds check (BCAST result impossible) */
>  		BUILD_BUG_ON(EFX_EF10_BCAST != 0);
> -		if (encap_type > ARRAY_SIZE(map) || map[encap_type] == 0) {
> +		if (encap_type >= ARRAY_SIZE(map) || map[encap_type] == 0) {
>  			WARN_ON(1);
>  			return -EINVAL;
>  		}