[PATCH AUTOSEL 4.4 14/64] rt_cpu_seq_next should increase position index

Sasha Levin
2020-09-18T02:17:18Z

From: Vasily Averin <vvs@virtuozzo.com>

[ 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>
---
net/ipv4/route.c | 1 +
1 file changed, 1 insertion(+)

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;

}
--
2.25.1