linux-kernel - [PATCH 4.19 20/72] 9p/trans_fd: put worker reqs on destroy

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Message-Id: <20190702080125.710733925@linuxfoundation.org>
Date:   Tue,  2 Jul 2019 10:01:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Dominique Martinet <dominique.martinet@....fr>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        Tomas Bortoli <tomasbortoli@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 20/72] 9p/trans_fd: put worker reqs on destroy

[ Upstream commit fb488fc1f2b4c5128540b032892ddec91edaf8d9 ]

p9_read_work/p9_write_work might still hold references to a req after
having been cancelled; make sure we put any of these to avoid potential
request leak on disconnect.

Fixes: 728356dedeff8 ("9p: Add refcount to p9_req_t")
Link: http://lkml.kernel.org/r/1539057956-23741-2-git-send-email-asmadeus@codewreck.org
Signed-off-by: Dominique Martinet <dominique.martinet@....fr>
Cc: Eric Van Hensbergen <ericvh@...il.com>
Cc: Latchesar Ionkov <lucho@...kov.net>
Reviewed-by: Tomas Bortoli <tomasbortoli@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/9p/trans_fd.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index a0317d459cde..f868cf6fba79 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -876,7 +876,15 @@ static void p9_conn_destroy(struct p9_conn *m)
 
 	p9_mux_poll_stop(m);
 	cancel_work_sync(&m->rq);
+	if (m->rreq) {
+		p9_req_put(m->rreq);
+		m->rreq = NULL;
+	}
 	cancel_work_sync(&m->wq);
+	if (m->wreq) {
+		p9_req_put(m->wreq);
+		m->wreq = NULL;
+	}
 
 	p9_conn_cancel(m, -ECONNRESET);
 
-- 
2.20.1