From c663c5836cc73b3495f920fac03145c24c2ded66 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@hammerspace.com>
Date: Tue, 8 Jun 2021 21:22:53 +0800
Subject: [PATCH] NFSv4.1: Don't process the sequence op more than once.

mainline inclusion
from mainline-v5.0-rc1
commit c71c46f0157348a6c1c66f7d382c770ffc212724
category: bugfix
bugzilla: NA
CVE: NA

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

Ensure that if we call nfs41_sequence_process() a second time for the
same rpc_task, then we only process the results once.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 fs/nfs/nfs4proc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 283e4ed1aca1..c138dd107d4a 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -770,7 +770,7 @@ static int nfs41_sequence_process(struct rpc_task *task,
 	if (slot == NULL)
 		goto out_noaction;
 	/* don't increment the sequence number if the task wasn't sent */
-	if (!RPC_WAS_SENT(task))
+	if (!RPC_WAS_SENT(task) || slot->seq_done)
 		goto out;
 
 	session = slot->table->session;
-- 
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