netdev - [PATCH 1/6] seq_tab_next() should increase position index

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Message-ID: <33f87dd6-b58c-ae0b-23da-4615b72dd797@virtuozzo.com>
Date:   Thu, 23 Jan 2020 10:11:08 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Vishal Kulkarni <vishal@...lsio.com>, netdev@...r.kernel.org
Subject: [PATCH 1/6] seq_tab_next() should increase position index

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@...tuozzo.com>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index aca9f7a..4144c23 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
@@ -70,8 +70,7 @@ static void *seq_tab_start(struct seq_file *seq, loff_t *pos)
 static void *seq_tab_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	v = seq_tab_get_idx(seq->private, *pos + 1);
-	if (v)
-		++*pos;
+	++(*pos);
 	return v;
 }

-- 
1.8.3.1