netdev - [PATCH] net: rds: don't hold sock lock when cancelling work from rds_tcp_reset

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Message-ID: <3de97b2d-1c15-5dda-4fe2-78311a91d861@I-love.SAKURA.ne.jp>
Date:   Thu, 29 Sep 2022 00:25:37 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sowmini Varadhan <sowmini.varadhan@...cle.com>,
        Hillf Danton <hdanton@...a.com>
Cc:     syzkaller-bugs@...glegroups.com,
        syzbot <syzbot+78c55c7bc6f66e53dce2@...kaller.appspotmail.com>,
        Network Development <netdev@...r.kernel.org>,
        OFED mailing list <linux-rdma@...r.kernel.org>
Subject: [PATCH] net: rds: don't hold sock lock when cancelling work from
 rds_tcp_reset_callbacks()

syzbot is reporting lockdep warning at rds_tcp_reset_callbacks() [1], for
commit ac3615e7f3cffe2a ("RDS: TCP: Reduce code duplication in
rds_tcp_reset_callbacks()") added cancel_delayed_work_sync() into a section
protected by lock_sock() without realizing that rds_send_xmit() might call
lock_sock().

We don't need to protect cancel_delayed_work_sync() using lock_sock(), for
even if rds_{send,recv}_worker() re-queued this work while __flush_work()
 from cancel_delayed_work_sync() was waiting for this work to complete,
retried rds_{send,recv}_worker() is no-op due to the absence of RDS_CONN_UP
bit.

Link: https://syzkaller.appspot.com/bug?extid=78c55c7bc6f66e53dce2 [1]
Reported-by: syzbot <syzbot+78c55c7bc6f66e53dce2@...kaller.appspotmail.com>
Co-developed-by: Hillf Danton <hdanton@...a.com>
Signed-off-by: Hillf Danton <hdanton@...a.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Tested-by: syzbot <syzbot+78c55c7bc6f66e53dce2@...kaller.appspotmail.com>
Fixes: ac3615e7f3cffe2a ("RDS: TCP: Reduce code duplication in rds_tcp_reset_callbacks()")
---
Hillf, why don't you propose as a formal patch after syzbot tested your patch?
Explaining as a formal patch helps us with understanding/reviewing what you thought and
how you came to your patch. I feel sorry for stealing result of your trial and error...

 net/rds/tcp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/rds/tcp.c b/net/rds/tcp.c
index 73ee2771093d..d0ff413f697c 100644
--- a/net/rds/tcp.c
+++ b/net/rds/tcp.c
@@ -166,10 +166,10 @@ void rds_tcp_reset_callbacks(struct socket *sock,
 	 */
 	atomic_set(&cp->cp_state, RDS_CONN_RESETTING);
 	wait_event(cp->cp_waitq, !test_bit(RDS_IN_XMIT, &cp->cp_flags));
-	lock_sock(osock->sk);
 	/* reset receive side state for rds_tcp_data_recv() for osock  */
 	cancel_delayed_work_sync(&cp->cp_send_w);
 	cancel_delayed_work_sync(&cp->cp_recv_w);
+	lock_sock(osock->sk);
 	if (tc->t_tinc) {
 		rds_inc_put(&tc->t_tinc->ti_inc);
 		tc->t_tinc = NULL;
-- 
2.34.1