linux-kernel - Re: [PATCH net 1/2] openvswitch: switch from WARN to pr

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Message-ID: <b0495014-0673-1ac3-5c9f-b12f947d9cb2@ovn.org>
Date:   Thu, 20 Oct 2022 20:40:07 +0200
From:   Ilya Maximets <i.maximets@....org>
To:     Aaron Conole <aconole@...hat.com>, netdev@...r.kernel.org
Cc:     i.maximets@....org, Pravin B Shelar <pshelar@....org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Thomas Graf <tgraf@...g.ch>,
        Kevin Sprague <ksprague0711@...il.com>, dev@...nvswitch.org,
        Eelco Chaudron <echaudro@...hat.com>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net 1/2] openvswitch: switch from WARN to pr_warn

On 10/19/22 20:30, Aaron Conole wrote:
> As noted by Paolo Abeni, pr_warn doesn't generate any splat and can still
> preserve the warning to the user that feature downgrade occurred.  We
> likely cannot introduce other kinds of checks / enforcement here because
> syzbot can generate different genl versions to the datapath.
> 
> Reported-by: syzbot+31cde0bef4bbf8ba2d86@...kaller.appspotmail.com
> Fixes: 44da5ae5fbea ("openvswitch: Drop user features if old user space attempted to create datapath")
> Cc: Thomas Graf <tgraf@...g.ch>
> Signed-off-by: Aaron Conole <aconole@...hat.com>
> ---
>  net/openvswitch/datapath.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
> index c8a9075ddd0a..155263e73512 100644
> --- a/net/openvswitch/datapath.c
> +++ b/net/openvswitch/datapath.c
> @@ -1616,7 +1616,8 @@ static void ovs_dp_reset_user_features(struct sk_buff *skb,
>  	if (IS_ERR(dp))
>  		return;
>  
> -	WARN(dp->user_features, "Dropping previously announced user features\n");
> +	pr_warn("%s: Dropping previously announced user features\n",
> +		ovs_dp_name(dp));
>  	dp->user_features = 0;
>  }
>  

Works fine.  Thanks!

Acked-by: Ilya Maximets <i.maximets@....org>