From: Paolo Abeni <pab...@redhat.com>
Date: Wed, 10 Jun 2020 10:47:41 +0200
> The msk sk_shutdown flag is set by a workqueue, possibly
> introducing some delay in user-space notification. If the last
> subflow carries some data with the fin packet, the user space
> can wake-up before RCV_SHUTDOWN is set. If it executes unblocking
> recvmsg(), it may return with an error instead of eof.
>
> Address the issue explicitly checking for eof in recvmsg(), when
> no data is found.
>
> Fixes: 59832e246515 ("mptcp: subflow: check parent mptcp socket on subflow
> state change")
> Signed-off-by: Paolo Abeni <pab...@redhat.com>
Applied, thanks Paolo.
