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    Subject[PATCH 4.9 18/63] net/9p/trans_fd.c: fix race-condition by flushing workqueue before the kfree()
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Tomas Bortoli <tomasbortoli@gmail.com>

    commit 430ac66eb4c5b5c4eb846b78ebf65747510b30f1 upstream.

    The patch adds the flush in p9_mux_poll_stop() as it the function used by
    p9_conn_destroy(), in turn called by p9_fd_close() to stop the async
    polling associated with the data regarding the connection.

    Link: http://lkml.kernel.org/r/20180720092730.27104-1-tomasbortoli@gmail.com
    Signed-off-by: Tomas Bortoli <tomasbortoli@gmail.com>
    Reported-by: syzbot+39749ed7d9ef6dfb23f6@syzkaller.appspotmail.com
    To: Eric Van Hensbergen <ericvh@gmail.com>
    To: Ron Minnich <rminnich@sandia.gov>
    To: Latchesar Ionkov <lucho@ionkov.net>
    Cc: Yiwen Jiang <jiangyiwen@huwei.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    net/9p/trans_fd.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/net/9p/trans_fd.c
    +++ b/net/9p/trans_fd.c
    @@ -181,6 +181,8 @@ static void p9_mux_poll_stop(struct p9_c
    spin_lock_irqsave(&p9_poll_lock, flags);
    list_del_init(&m->poll_pending_link);
    spin_unlock_irqrestore(&p9_poll_lock, flags);
    +
    + flush_work(&p9_poll_work);
    }

    /**

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