From: Vasily Averin <vvs@virtuozzo.com>
Date: Thu, 23 Jan 2020 07:11:28 +0000 (+0300)
Subject: neigh_stat_seq_next() should increase position index
X-Git-Tag: v4.14.200~124
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=c66173df61ce44aaa52e916e6f7d2f84b0f9c931;p=users%2Fdwmw2%2Flinux.git

neigh_stat_seq_next() should increase position index

[ Upstream commit 1e3f9f073c47bee7c23e77316b07bc12338c5bba ]

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/core/neighbour.c b/net/core/neighbour.c
index 567e431813e59..20f6c634ad68a 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2836,6 +2836,7 @@ static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 		*pos = cpu+1;
 		return per_cpu_ptr(tbl->stats, cpu);
 	}
+	(*pos)++;
 	return NULL;
 }