From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Thu, 12 Oct 2023 08:17:39 +0000 (+0200)
Subject: lib/test_meminit: fix off-by-one error in test_pages()
X-Git-Url: https://git.baikalelectronics.ru/?a=commitdiff_plain;h=38fd36728f40d7c83979d9b1443cffcf368790b0;p=kernel.git

lib/test_meminit: fix off-by-one error in test_pages()

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@linux.ibm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Xiaoke Wang <xkernel.wang@foxmail.com>
Cc: <stable@vger.kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/lib/test_meminit.c b/lib/test_meminit.c
index 0ae35223d7733..85d8dd8e01dc4 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();