[PATCH AUTOSEL 4.19 044/206] rt_cpu_seq_next should increase position index

From: Sasha Levin
Date: Thu Sep 17 2020 - 22:49:53 EST


From: Vasily Averin <vvs@xxxxxxxxxxxxx>

[ 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@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/ipv4/route.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index f752d22cc8a59..248bfaf82fe06 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -274,6 +274,7 @@ 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