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Date: Fri, 29 Jul 2022 17:06:09 +0300 From: Fedor Pchelkin <pchelkin@...ras.ru> To: Robin van der Gracht <robin@...tonic.nl>, Oleksij Rempel <linux@...pel-privat.de> Cc: Fedor Pchelkin <pchelkin@...ras.ru>, 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>, linux-can@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Alexey Khoroshilov <khoroshilov@...ras.ru>, ldv-project@...uxtesting.org Subject: [PATCH v2] can: j1939: Replace WARN_ON_ONCE with netdev_warn_once() in j1939_sk_queue_activate_next_locked() 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. So it would be good to replace it with netdev_warn_once() message. 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> --- v1 -> v2: Used netdev_warn_once() instead of pr_warn_once() net/can/j1939/socket.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c index f5ecfdcf57b2..09e1d78bd22c 100644 --- a/net/can/j1939/socket.c +++ b/net/can/j1939/socket.c @@ -178,7 +178,10 @@ 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)) { + netdev_warn_once(first->priv->ndev, + "%s: 0x%p: Identical session is already activated.\n", + __func__, first); first->err = -EBUSY; goto activate_next; } else { -- 2.25.1
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