netdev - Re: [PATCH net] mptcp: add dummy icsk_sync

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Message-Id: <20200226.205010.187250062705880561.davem@davemloft.net>
Date:   Wed, 26 Feb 2020 20:50:10 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     pabeni@...hat.com
Cc:     netdev@...r.kernel.org, paul@...l-moore.com,
        syzkaller-bugs@...glegroups.com, matthieu.baerts@...sares.net,
        mathew.j.martineau@...ux.intel.com
Subject: Re: [PATCH net] mptcp: add dummy icsk_sync_mss()

From: Paolo Abeni <pabeni@...hat.com>
Date: Wed, 26 Feb 2020 12:19:03 +0100

> syzbot noted that the master MPTCP socket lacks the icsk_sync_mss
> callback, and was able to trigger a null pointer dereference:
 ...
> Address the issue adding a dummy icsk_sync_mss callback.
> To properly sync the subflows mss and options list we need some
> additional infrastructure, which will land to net-next.
> 
> Reported-by: syzbot+f4dfece964792d80b139@...kaller.appspotmail.com
> Fixes: 2303f994b3e1 ("mptcp: Associate MPTCP context with TCP socket")
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>

Applied, thanks.