From: Alexander Aring <aahringo@redhat.com>
Date: Thu, 12 Jan 2023 17:10:34 -0500
Subject: [PATCH] fs: dlm: fix race setting stop tx flag
References: bsc#1012628
Patch-mainline: 6.2.3
Git-commit: 164272113b685927126c938b4a9cbd2075eb15ee

commit 164272113b685927126c938b4a9cbd2075eb15ee upstream.

This patch sets the stop tx flag before we commit the dlm message.
This flag will report about unexpected transmissions after we
send the DLM_FIN message out, which should be the last message sent.
When we commit the dlm fin message, it could be that we already
got an ack back and the CLOSED state change already happened.
We should not set this flag when we are in CLOSED state. To avoid this
race we simply set the tx flag before the state change can be in
progress by moving it before dlm_midcomms_commit_mhandle().

Cc: stable@vger.kernel.org
Fixes: 489d8e559c65 ("fs: dlm: add reliable connection if reconnect")
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 fs/dlm/midcomms.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/dlm/midcomms.c b/fs/dlm/midcomms.c
index a3eb19c8..9d459d5b 100644
--- a/fs/dlm/midcomms.c
+++ b/fs/dlm/midcomms.c
@@ -406,6 +406,7 @@ static int dlm_send_fin(struct midcomms_node *node,
 	if (!mh)
 		return -ENOMEM;
 
+	set_bit(DLM_NODE_FLAG_STOP_TX, &node->flags);
 	mh->ack_rcv = ack_rcv;
 
 	m_header = (struct dlm_header *)ppc;
@@ -417,7 +418,6 @@ static int dlm_send_fin(struct midcomms_node *node,
 
 	pr_debug("sending fin msg to node %d\n", node->nodeid);
 	dlm_midcomms_commit_mhandle(mh, NULL, 0);
-	set_bit(DLM_NODE_FLAG_STOP_TX, &node->flags);
 
 	return 0;
 }
-- 
2.35.3