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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Vasily Averin <vvs@virtuozzo.com>,
        Mike Marshall <hubcap@omnibond.com>,
        Sasha Levin <sashal@kernel.org>, devel@lists.orangefs.org
Subject: [PATCH AUTOSEL 4.9 141/141] help_next should increase position index
Date:   Fri, 14 Feb 2020 11:21:21 -0500
Message-Id: <20200214162122.19794-141-sashal@kernel.org>
In-Reply-To: <20200214162122.19794-1-sashal@kernel.org>
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From: Vasily Averin <vvs@virtuozzo.com>

[ Upstream commit 9f198a2ac543eaaf47be275531ad5cbd50db3edf ]

if seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.

https://bugzilla.kernel.org/show_bug.cgi?id=206283
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/orangefs/orangefs-debugfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/orangefs/orangefs-debugfs.c b/fs/orangefs/orangefs-debugfs.c
index 0748a26598fca..7d7df003f9d8d 100644
--- a/fs/orangefs/orangefs-debugfs.c
+++ b/fs/orangefs/orangefs-debugfs.c
@@ -304,6 +304,7 @@ static void *help_start(struct seq_file *m, loff_t *pos)
 
 static void *help_next(struct seq_file *m, void *v, loff_t *pos)
 {
+	(*pos)++;
 	gossip_debug(GOSSIP_DEBUGFS_DEBUG, "help_next: start\n");
 
 	return NULL;
-- 
2.20.1