From: Vasily Averin <vvs@virtuozzo.com>
Date: Thu, 23 Jan 2020 07:11:35 +0000 (+0300)
Subject: rt_cpu_seq_next should increase position index
X-Git-Tag: v4.4.238~62
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=424230861bfb7f69cc97f9b41014fdae608b0a83;p=thirdparty%2Fkernel%2Fstable.git

rt_cpu_seq_next should increase position index

[ Upstream commit a3ea86739f1bc7e121d921842f0f4a8ab1af94d9 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 542f6e0f438f1..ea1c319100a5d 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -271,6 +271,7 @@ static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 		*pos = cpu+1;
 		return &per_cpu(rt_cache_stat, cpu);
 	}
+	(*pos)++;
 	return NULL;
 
 }