netdev - Re: [PATCH v2] can: fix skb reference counting in j1939_session

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Message-ID: <Z0m53JjLCTEm7On8@pengutronix.de>
Date: Fri, 29 Nov 2024 13:55:56 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Dmitry Antipov <dmantipov@...dex.ru>
Cc: Robin van der Gracht <robin@...tonic.nl>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Marc Kleine-Budde <mkl@...gutronix.de>, linux-can@...r.kernel.org,
	netdev@...r.kernel.org, lvc-project@...uxtesting.org,
	syzbot+d4e8dc385d9258220c31@...kaller.appspotmail.com
Subject: Re: [PATCH v2] can: fix skb reference counting in j1939_session_new()

On Tue, Nov 05, 2024 at 12:48:23PM +0300, Dmitry Antipov wrote:
> Since 'j1939_session_skb_queue()' do an extra 'skb_get()' for each
> new skb, I assume that the same should be done for an initial one
> in 'j1939_session_new()' just to avoid refcount underflow.
> 
> Reported-by: syzbot+d4e8dc385d9258220c31@...kaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=d4e8dc385d9258220c31
> Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
> Signed-off-by: Dmitry Antipov <dmantipov@...dex.ru>

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

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