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Subject: Re: [PATCH] net: bcmgenet: fix mask check in bcmgenet_validate_flow()
To:     Denis Efremov <efremov@linux.com>
Cc:     Florian Fainelli <f.fainelli@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        bcm-kernel-feedback-list@broadcom.com, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
References: <20200902111845.9915-1-efremov@linux.com>
From:   Doug Berger <opendmb@gmail.com>
Message-ID: <74100a9f-5215-ed55-7077-a180a85f775a@gmail.com>
Date:   Wed, 2 Sep 2020 10:53:51 -0700
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On 9/2/2020 4:18 AM, Denis Efremov wrote:
> VALIDATE_MASK(eth_mask->h_source) is checked twice in a row in
> bcmgenet_validate_flow(). Add VALIDATE_MASK(eth_mask->h_dest)
> instead.
> 
> Fixes: 3e370952287c ("net: bcmgenet: add support for ethtool rxnfc flows")
> Cc: stable@vger.kernel.org
> Signed-off-by: Denis Efremov <efremov@linux.com>
> ---
> I'm not sure that h_dest check is required here, it's only my guess.
> Compile tested only.
> 
>  drivers/net/ethernet/broadcom/genet/bcmgenet.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> index 0ca8436d2e9d..be85dad2e3bc 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> @@ -1364,7 +1364,7 @@ static int bcmgenet_validate_flow(struct net_device *dev,
>  	case ETHER_FLOW:
>  		eth_mask = &cmd->fs.m_u.ether_spec;
>  		/* don't allow mask which isn't valid */
> -		if (VALIDATE_MASK(eth_mask->h_source) ||
> +		if (VALIDATE_MASK(eth_mask->h_dest) ||
>  		    VALIDATE_MASK(eth_mask->h_source) ||
>  		    VALIDATE_MASK(eth_mask->h_proto)) {
>  			netdev_err(dev, "rxnfc: Unsupported mask\n");
> 
Well spotted. Thanks!

Acked-by: Doug Berger <opendmb@gmail.com>