linux-kernel - [PATCH] kunit: print a message before triggering a NULL dereference

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Message-ID: <aLq8wXJraE3SBPnP@stanley.mountain>
Date: Fri, 5 Sep 2025 13:34:41 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Mickaël Salaün <mic@...ikod.net>
Cc: Brendan Higgins <brendan.higgins@...ux.dev>,
	David Gow <davidgow@...gle.com>, Rae Moar <rmoar@...gle.com>,
	linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] kunit: print a message before triggering a NULL dereference

Print a message so that people reading dmesg know that these NULL
dereferences are not a bug, but instead a deliberate part of
the testing.

Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 lib/kunit/kunit-test.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c
index 8c01eabd4eaf..a8b6e16f4465 100644
--- a/lib/kunit/kunit-test.c
+++ b/lib/kunit/kunit-test.c
@@ -119,6 +119,8 @@ static void kunit_test_null_dereference(void *data)
 	struct kunit *test = data;
 	int *null = NULL;
 
+	pr_info("Triggering deliberate NULL derefence.\n");
+
 	*null = 0;
 
 	KUNIT_FAIL(test, "This line should never be reached\n");
-- 
2.47.2