From: Vasily Averin <vvs@virtuozzo.com>
Date: Thu, 23 Jan 2020 10:11:35 +0300
Subject: rt_cpu_seq_next should increase position index
Patch-mainline: v5.5
Git-commit: a3ea86739f1bc7e121d921842f0f4a8ab1af94d9
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/ipv4/route.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -270,6 +270,7 @@ static void *rt_cpu_seq_next(struct seq_
 		*pos = cpu+1;
 		return &per_cpu(rt_cache_stat, cpu);
 	}
+	(*pos)++;
 	return NULL;
 
 }