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Date:   Sat, 25 Apr 2020 20:40:14 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] mptcp: fix race in msk status update

From: Paolo Abeni <>
Date: Fri, 24 Apr 2020 13:15:21 +0200

> Currently subflow_finish_connect() changes unconditionally
> any msk socket status other than TCP_ESTABLISHED.
> If an unblocking connect() races with close(), we can end-up
> triggering:
> IPv4: Attempt to release TCP socket in state 1 00000000e32b8b7e
> when the msk socket is disposed.
> Be sure to enter the established status only from SYN_SENT.
> Fixes: c3c123d16c0e ("net: mptcp: don't hang in mptcp_sendmsg() after TCP fallback")
> Signed-off-by: Paolo Abeni <>

Applied, thanks.

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