linux-kernel - [PATCH 4.9 14/80] kernel/gcov/fs.c: gcov_seq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200501131518.274814134@linuxfoundation.org>
Date:   Fri,  1 May 2020 15:21:08 +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 4.9 14/80] 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 edf67c493a8e1..e473f6a1f6ca7 100644
--- a/kernel/gcov/fs.c
+++ b/kernel/gcov/fs.c
@@ -108,9 +108,9 @@ 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