linux-kernel - [PATCH] kunit/overflow: Fix UB in overflow_allocation

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Message-Id: <20240815000431.401869-1-ivan.orlov0322@gmail.com>
Date: Thu, 15 Aug 2024 01:04:31 +0100
From: Ivan Orlov <ivan.orlov0322@...il.com>
To: akpm@...ux-foundation.org,
	kees@...nel.org,
	davidgow@...gle.com
Cc: Ivan Orlov <ivan.orlov0322@...il.com>,
	kunit-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	erhard_f@...lbox.org
Subject: [PATCH] kunit/overflow: Fix UB in overflow_allocation_test

The 'device_name' array doesn't exist out of the
'overflow_allocation_test' function scope. However, it is being used as
a driver name when calling 'kunit_driver_create' from
'kunit_device_register'. It produces the kernel panic with KASAN
enabled.

Since this variable is used in one place only, remove it and pass the
device name into kunit_device_register directly as an ascii string.

Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>
---
 lib/overflow_kunit.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/overflow_kunit.c b/lib/overflow_kunit.c
index f314a0c15a6d..2abc78367dd1 100644
--- a/lib/overflow_kunit.c
+++ b/lib/overflow_kunit.c
@@ -668,7 +668,6 @@ DEFINE_TEST_ALLOC(devm_kzalloc,  devm_kfree, 1, 1, 0);
 
 static void overflow_allocation_test(struct kunit *test)
 {
-	const char device_name[] = "overflow-test";
 	struct device *dev;
 	int count = 0;
 
@@ -678,7 +677,7 @@ static void overflow_allocation_test(struct kunit *test)
 } while (0)
 
 	/* Create dummy device for devm_kmalloc()-family tests. */
-	dev = kunit_device_register(test, device_name);
+	dev = kunit_device_register(test, "overflow-test");
 	KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev),
 			       "Cannot register test device\n");
 
-- 
2.34.1