From: Vasily Averin <vvs@virtuozzo.com>
Date: Thu, 23 Jan 2020 10:11:20 +0300
Subject: vcc_seq_next should increase position index
Patch-mainline: v5.5
Git-commit: 8bf7092021f283944f0c5f4c364853201c45c611
References: bsc#1154353

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: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/atm/proc.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/net/atm/proc.c
+++ b/net/atm/proc.c
@@ -134,8 +134,7 @@ static void vcc_seq_stop(struct seq_file
 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	v = vcc_walk(seq, 1);
-	if (v)
-		(*pos)++;
+	(*pos)++;
 	return v;
 }