linux-kernel - [PATCH 4.4 12/47] net/9p/trans_fd.c: fix race-condition by flushing workqueue before the kfree()

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Message-Id: <20180907210905.598511701@linuxfoundation.org>
Date:   Fri,  7 Sep 2018 23:10:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org,
        Eric Van Hensbergen <ericvh@...il.com>,
        Ron Minnich <rminnich@...dia.gov>,
        Latchesar Ionkov <lucho@...kov.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tomas Bortoli <tomasbortoli@...il.com>,
        syzbot+39749ed7d9ef6dfb23f6@...kaller.appspotmail.com,
        Yiwen Jiang <jiangyiwen@...ei.com>,
        Dominique Martinet <dominique.martinet@....fr>
Subject: [PATCH 4.4 12/47] net/9p/trans_fd.c: fix race-condition by flushing workqueue before the kfree()

4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Tomas Bortoli <tomasbortoli@...il.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@...il.com>
Reported-by: syzbot+39749ed7d9ef6dfb23f6@...kaller.appspotmail.com
To: Eric Van Hensbergen <ericvh@...il.com>
To: Ron Minnich <rminnich@...dia.gov>
To: Latchesar Ionkov <lucho@...kov.net>
Cc: Yiwen Jiang <jiangyiwen@...ei.com>
Cc: stable@...r.kernel.org
Signed-off-by: Dominique Martinet <dominique.martinet@....fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -185,6 +185,8 @@ 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);
 }
 
 /**