linux-kernel - Re: [PATCH net] net: dsa: bcm_sf2: Fix RX_CLS_LOC

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Date:   Fri, 11 May 2018 16:38:02 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: dsa: bcm_sf2: Fix RX_CLS_LOC_ANY overwrite for
 last rule

On 05/11/2018 04:24 PM, Florian Fainelli wrote:
> When we let the kernel pick up a rule location with RX_CLS_LOC_ANY, we
> would be able to overwrite the last rules because of a number of issues:
> 
> - the IPv4 code path would not be checking that rule_index is within
>   bounds, the IPv6 code path would only be checking the second index and
>   not the first one
> 
> - find_first_zero_bit() needs to operate on the full bitmap size
>   (priv->num_cfp_rules) otherwise it would be off by one in the results
>   it returns and the checks against bcm_sf2_cfp_rule_size() would be non
>   functioning
> 
> Fixes: 3306145866b6 ("net: dsa: bcm_sf2: Move IPv4 CFP processing to specific functions")
> Fixes: ba0696c22e7c ("net: dsa: bcm_sf2: Add support for IPv6 CFP rules")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

David, please discard that for now, the IPv4 part is correct, but I am
not fixing the bug correctly for the IPv6 part. v2 coming some time next
week. Thank you!
-- 
Florian