linux-kernel - [PATCH 6.1 6/6] lib/test_meminit: fix off-by-one error in test

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Message-ID: <20231012180030.279678796@linuxfoundation.org>
Date:   Thu, 12 Oct 2023 20:00:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        patches@...ts.linux.dev, Andrew Donnellan <ajd@...ux.ibm.com>,
        Alexander Potapenko <glider@...gle.com>,
        Xiaoke Wang <xkernel.wang@...mail.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 6.1 6/6] lib/test_meminit: fix off-by-one error in test_pages()

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

commit efb78fa86e95 ("lib/test_meminit: allocate pages up to order
MAX_ORDER") works great in kernels 6.4 and newer thanks to commit
23baf831a32c ("mm, treewide: redefine MAX_ORDER sanely"), but for older
kernels, the loop is off by one, which causes crashes when the test
runs.

Fix this up by changing "<= MAX_ORDER" "< MAX_ORDER" to allow the test
to work properly for older kernel branches.

Fixes: 421855d0d24d ("lib/test_meminit: allocate pages up to order MAX_ORDER")
Cc: Andrew Donnellan <ajd@...ux.ibm.com>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Xiaoke Wang <xkernel.wang@...mail.com>
Cc: <stable@...r.kernel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 lib/test_meminit.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/test_meminit.c
+++ b/lib/test_meminit.c
@@ -93,7 +93,7 @@ static int __init test_pages(int *total_
 	int failures = 0, num_tests = 0;
 	int i;
 
-	for (i = 0; i <= MAX_ORDER; i++)
+	for (i = 0; i < MAX_ORDER; i++)
 		num_tests += do_alloc_pages_order(i, &failures);
 
 	REPORT_FAILURES_IN_FN();