From: Vasily Averin <vvs@virtuozzo.com>
Date: Fri, 10 Apr 2020 21:34:10 +0000 (-0700)
Subject: kernel/gcov/fs.c: gcov_seq_next() should increase position index
X-Git-Tag: v4.14.178~103
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1a461aa9842bb737efe2ebc3e89b2a3dc2818c0e;p=thirdparty%2Fkernel%2Fstable.git

kernel/gcov/fs.c: gcov_seq_next() should increase position index

[ 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@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: NeilBrown <neilb@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Waiman Long <longman@redhat.com>
Link: http://lkml.kernel.org/r/f65c6ee7-bd00-f910-2f8a-37cc67e4ff88@virtuozzo.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

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;
 }