linux-kernel - Re: [PATCH v2 net] net: dsa: microchip: provide a list of valid protocols for xmit handler

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Message-ID: <20231206201054.7ketpxxox5y2wnby@skbuf>
Date:   Wed, 6 Dec 2023 22:10:54 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Sean Nyekjaer <sean@...nix.com>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Arun Ramadoss <arun.ramadoss@...rochip.com>,
        Christian Eggers <ceggers@...i.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net] net: dsa: microchip: provide a list of valid
 protocols for xmit handler

On Wed, Dec 06, 2023 at 08:16:54AM +0100, Sean Nyekjaer wrote:
> Provide a list of valid protocols for which the driver will provide
> it's deferred xmit handler.
> 
> When using DSA_TAG_PROTO_KSZ8795 protocol, it does not provide a
> "connect" method, therefor ksz_connect() is not allocating ksz_tagger_data.
> 
> This avoids the following null pointer dereference:
>  ksz_connect_tag_protocol from dsa_register_switch+0x9ac/0xee0
>  dsa_register_switch from ksz_switch_register+0x65c/0x828
>  ksz_switch_register from ksz_spi_probe+0x11c/0x168
>  ksz_spi_probe from spi_probe+0x84/0xa8
>  spi_probe from really_probe+0xc8/0x2d8
> 
> Fixes: ab32f56a4100 ("net: dsa: microchip: ptp: add packet transmission timestamping")
> Signed-off-by: Sean Nyekjaer <sean@...nix.com>
> ---

Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>