linux-kernel - Re: [PATCH] can: j1939: call j1939_priv_put() immediately when j1939_local_ecu

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Message-ID: <aLqfpqn80TphoBG2@pengutronix.de>
Date: Fri, 5 Sep 2025 10:30:30 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc: Robin van der Gracht <robin@...tonic.nl>, kernel@...gutronix.de,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Marc Kleine-Budde <mkl@...gutronix.de>, linux-can@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] can: j1939: call j1939_priv_put() immediately when
 j1939_local_ecu_get() failed

On Sun, Aug 24, 2025 at 07:30:09PM +0900, Tetsuo Handa wrote:
> Commit 25fe97cb7620 ("can: j1939: move j1939_priv_put() into sk_destruct
> callback") expects that a call to j1939_priv_put() can be unconditionally
> delayed until j1939_sk_sock_destruct() is called. But a refcount leak will
> happen when j1939_sk_bind() is called again after j1939_local_ecu_get()
>  from previous j1939_sk_bind() call returned an error. We need to call
> j1939_priv_put() before j1939_sk_bind() returns an error.
> 
> Fixes: 25fe97cb7620 ("can: j1939: move j1939_priv_put() into sk_destruct callback")
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>

Tested-by: Oleksij Rempel <o.rempel@...gutronix.de>                                                                                                             
Acked-by: Oleksij Rempel <o.rempel@...gutronix.de>

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