Re: [PATCH net] ethtool: pse-pd: fix null-deref on genl_info in dump

[Oleksij Rempel <o.rempel@pengutronix.de>]

On Wed, Oct 19, 2022 at 03:35:51PM -0700, Jakub Kicinski wrote:
> ethnl_default_dump_one() passes NULL as info.
> 
> It's correct not to set extack during dump, as we should just
> silently skip interfaces which can't provide the information.
> 
> Reported-by: syzbot+81c4b4bbba6eea2cfcae@syzkaller.appspotmail.com
> Fixes: 18ff0bcda6d1 ("ethtool: add interface to interact with Ethernet Power Equipment")
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
> ---
> CC: andrew@lunn.ch
> CC: linux@rempel-privat.de
> CC: bagasdotme@gmail.com
> CC: lkp@intel.com

Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>

Thank you!

> ---
>  net/ethtool/pse-pd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ethtool/pse-pd.c b/net/ethtool/pse-pd.c
> index 5a471e115b66..e8683e485dc9 100644
> --- a/net/ethtool/pse-pd.c
> +++ b/net/ethtool/pse-pd.c
> @@ -64,7 +64,7 @@ static int pse_prepare_data(const struct ethnl_req_info *req_base,
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = pse_get_pse_attributes(dev, info->extack, data);
> +	ret = pse_get_pse_attributes(dev, info ? info->extack : NULL, data);
>  
>  	ethnl_ops_complete(dev);
>  
> -- 
> 2.37.3
> 
> 

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |