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

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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>