linux-kernel - Re: [PATCH] can: j1939: Replace WARN_ON_ONCE with pr_warn_once() in j1939_sk_queue_activate_next

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Date:   Thu, 28 Jul 2022 18:58:28 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Fedor Pchelkin <pchelkin@...ras.ru>
Cc:     Robin van der Gracht <robin@...tonic.nl>,
        Oleksij Rempel <linux@...pel-privat.de>, kernel@...gutronix.de,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Van Dijck <dev.kurt@...dijck-laurijssen.be>,
        Bastian Stender <bst@...gutronix.de>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        ldv-project@...uxtesting.org
Subject: Re: [PATCH] can: j1939: Replace WARN_ON_ONCE with pr_warn_once() in
 j1939_sk_queue_activate_next_locked()

Hi Fedor,

thank you for your patch.

On Thu, Jul 28, 2022 at 07:34:29PM +0300, Fedor Pchelkin wrote:
> We should warn user-space that it is doing something wrong when trying to
> activate sessions with identical parameters but WARN_ON_ONCE macro can not
> be used here as it serves a different purpose.
> 
> Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
> 
> Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
> Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
> ---
>  net/can/j1939/socket.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c
> index f5ecfdcf57b2..67e8b50b8bc1 100644
> --- a/net/can/j1939/socket.c
> +++ b/net/can/j1939/socket.c
> @@ -178,7 +178,8 @@ static void j1939_sk_queue_activate_next_locked(struct j1939_session *session)
>  	if (!first)
>  		return;
>  
> -	if (WARN_ON_ONCE(j1939_session_activate(first))) {
> +	if (j1939_session_activate(first)) {
> +		pr_warn_once("can: j1939: Identical session is already activated.\n");

please use netdev_warn_once().
Otherwise looks good.

>  		first->err = -EBUSY;
>  		goto activate_next;
>  	} else {
> -- 
> 2.25.1
> 
> 

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