netdev - Re: [PATCH net-next] mptcp: fix race in subflow_data

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Message-Id: <20200706.133142.2053119289184509872.davem@davemloft.net>
Date:   Mon, 06 Jul 2020 13:31:42 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     dcaratti@...hat.com
Cc:     mathew.j.martineau@...ux.intel.com, matthieu.baerts@...sares.net,
        netdev@...r.kernel.org, mptcp@...ts.01.org
Subject: Re: [PATCH net-next] mptcp: fix race in subflow_data_ready()

From: Davide Caratti <dcaratti@...hat.com>
Date: Mon,  6 Jul 2020 21:06:12 +0200

> syzkaller was able to make the kernel reach subflow_data_ready() for a
> server subflow that was closed before subflow_finish_connect() completed.
> In these cases we can avoid using the path for regular/fallback MPTCP
> data, and just wake the main socket, to avoid the following warning:
 ...
> Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/39
> Reported-by: Christoph Paasch <cpaasch@...le.com>
> Fixes: e1ff9e82e2ea ("net: mptcp: improve fallback to TCP")
> Suggested-by: Paolo Abeni <pabeni@...hat.com>
> Signed-off-by: Davide Caratti <dcaratti@...hat.com>

Applied, thank you.