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

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Date:   Thu, 12 Oct 2023 10:17:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Alexander Potapenko <glider@...gle.com>,
        Xiaoke Wang <xkernel.wang@...mail.com>, stable@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] lib/test_meminit: fix off-by-one error in test_pages()

In commit efb78fa86e95 ("lib/test_meminit: allocate pages up to order
MAX_ORDER"), the loop for testing pages is set to "<= MAX_ORDER" which
causes crashes in systems when run.  Fix this to "< MAX_ORDER" to fix
the test to work properly.

Fixes: efb78fa86e95 ("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(-)

diff --git a/lib/test_meminit.c b/lib/test_meminit.c
index 0ae35223d773..85d8dd8e01dc 100644
--- a/lib/test_meminit.c
+++ b/lib/test_meminit.c
@@ -93,7 +93,7 @@ static int __init test_pages(int *total_failures)
 	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();
-- 
2.42.0