linux-kernel - [PATCH AUTOSEL 6.7 13/18] kunit: Reset test->priv after each param iteration

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Date: Mon, 15 Jan 2024 19:12:55 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Michal Wajdeczko <michal.wajdeczko@...el.com>,
	David Gow <davidgow@...gle.com>,
	Rae Moar <rmoar@...gle.com>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Sasha Levin <sashal@...nel.org>,
	linux-kselftest@...r.kernel.org,
	kunit-dev@...glegroups.com
Subject: [PATCH AUTOSEL 6.7 13/18] kunit: Reset test->priv after each param iteration

From: Michal Wajdeczko <michal.wajdeczko@...el.com>

[ Upstream commit 342fb9789267ee3908959bfa136b82e88e2ce918 ]

If we run parameterized test that uses test->priv to prepare some
custom data, then value of test->priv will leak to the next param
iteration and may be unexpected.  This could be easily seen if
we promote example_priv_test to parameterized test as then only
first test iteration will be successful:

$ ./tools/testing/kunit/kunit.py run \
	--kunitconfig ./lib/kunit/.kunitconfig *.example_priv*

[ ] Starting KUnit Kernel (1/1)...
[ ] ============================================================
[ ] =================== example (1 subtest) ====================
[ ] ==================== example_priv_test  ====================
[ ] [PASSED] example value 3
[ ] # example_priv_test: initializing
[ ] # example_priv_test: ASSERTION FAILED at lib/kunit/kunit-example-test.c:230
[ ] Expected test->priv == ((void *)0), but
[ ]     test->priv == 0000000060dfe290
[ ]     ((void *)0) == 0000000000000000
[ ] # example_priv_test: cleaning up
[ ] [FAILED] example value 2
[ ] # example_priv_test: initializing
[ ] # example_priv_test: ASSERTION FAILED at lib/kunit/kunit-example-test.c:230
[ ] Expected test->priv == ((void *)0), but
[ ]     test->priv == 0000000060dfe290
[ ]     ((void *)0) == 0000000000000000
[ ] # example_priv_test: cleaning up
[ ] [FAILED] example value 1
[ ] # example_priv_test: initializing
[ ] # example_priv_test: ASSERTION FAILED at lib/kunit/kunit-example-test.c:230
[ ] Expected test->priv == ((void *)0), but
[ ]     test->priv == 0000000060dfe290
[ ]     ((void *)0) == 0000000000000000
[ ] # example_priv_test: cleaning up
[ ] [FAILED] example value 0
[ ] # example_priv_test: initializing
[ ] # example_priv_test: cleaning up
[ ] # example_priv_test: pass:1 fail:3 skip:0 total:4
[ ] ================ [FAILED] example_priv_test ================
[ ]     # example: initializing suite
[ ]     # module: kunit_example_test
[ ]     # example: exiting suite
[ ] # Totals: pass:1 fail:3 skip:0 total:4
[ ] ===================== [FAILED] example =====================

Fix that by resetting test->priv after each param iteration, in
similar way what we did for the test->status.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@...el.com>
Cc: David Gow <davidgow@...gle.com>
Cc: Rae Moar <rmoar@...gle.com>
Reviewed-by: David Gow <davidgow@...gle.com>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 lib/kunit/test.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index 7aceb07a1af9..1cdc405daa30 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -660,6 +660,7 @@ int kunit_run_tests(struct kunit_suite *suite)
 				test.param_index++;
 				test.status = KUNIT_SUCCESS;
 				test.status_comment[0] = '\0';
+				test.priv = NULL;
 			}
 		}
 
-- 
2.43.0