vcc_seq_next should increase position index

[ Upstream commit 8bf7092021f283944f0c5f4c364853201c45c611 ]

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/atm/proc.c b/net/atm/proc.c
index d79221fd4dae2e8b13ac0725899a1b26a559db44..c318967073139dd4add6eb0e10591b6fada22800 100644 (file)
--- a/net/atm/proc.c
+++ b/net/atm/proc.c
@@ -134,8 +134,7 @@ static void vcc_seq_stop(struct seq_file *seq, void *v)
 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
        v = vcc_walk(seq, 1);
-       if (v)
-               (*pos)++;
+       (*pos)++;
        return v;
 }