linux-kernel - [PATCH 4.14 015/117] kernel/gcov/fs.c: gcov_seq

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Date:   Fri,  1 May 2020 15:20:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vasily Averin <vvs@...tuozzo.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Davidlohr Bueso <dave@...olabs.net>,
        Ingo Molnar <mingo@...hat.com>,
        Manfred Spraul <manfred@...orfullife.com>,
        NeilBrown <neilb@...e.com>, Steven Rostedt <rostedt@...dmis.org>,
        Waiman Long <longman@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 015/117] kernel/gcov/fs.c: gcov_seq_next() should increase position index

From: Vasily Averin <vvs@...tuozzo.com>

[ Upstream commit f4d74ef6220c1eda0875da30457bef5c7111ab06 ]

If seq_file .next function 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@...tuozzo.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Acked-by: Peter Oberparleiter <oberpar@...ux.ibm.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Davidlohr Bueso <dave@...olabs.net>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Manfred Spraul <manfred@...orfullife.com>
Cc: NeilBrown <neilb@...e.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Waiman Long <longman@...hat.com>
Link: http://lkml.kernel.org/r/f65c6ee7-bd00-f910-2f8a-37cc67e4ff88@virtuozzo.com
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/gcov/fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/gcov/fs.c b/kernel/gcov/fs.c
index 6e40ff6be083d..291e0797125b6 100644
--- a/kernel/gcov/fs.c
+++ b/kernel/gcov/fs.c
@@ -109,9 +109,9 @@ static void *gcov_seq_next(struct seq_file *seq, void *data, loff_t *pos)
 {
 	struct gcov_iterator *iter = data;
 
+	(*pos)++;
 	if (gcov_iter_next(iter))
 		return NULL;
-	(*pos)++;
 
 	return iter;
 }
-- 
2.20.1