linux-kernel - [PATCH] kunit: Fix NULL-dereference in kunit_init

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Date: Mon, 18 Dec 2023 15:17:29 +0000
From: Richard Fitzgerald <rf@...nsource.cirrus.com>
To: <brendan.higgins@...ux.dev>, <davidgow@...gle.com>, <rmoar@...gle.com>
CC: <linux-kselftest@...r.kernel.org>, <kunit-dev@...glegroups.com>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        "Richard
 Fitzgerald" <rf@...nsource.cirrus.com>
Subject: [PATCH] kunit: Fix NULL-dereference in kunit_init_suite() if suite->log is NULL

suite->log must be checked for NULL before passing it to
string_stream_clear(). This was done in kunit_init_test() but was missing
from kunit_init_suite().

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
Fixes: 6d696c4695c5 ("kunit: add ability to run tests after boot using debugfs")
---
 lib/kunit/test.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index e803d998e855..ea7f0913e55a 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -658,7 +658,9 @@ static void kunit_init_suite(struct kunit_suite *suite)
 	kunit_debugfs_create_suite(suite);
 	suite->status_comment[0] = '\0';
 	suite->suite_init_err = 0;
-	string_stream_clear(suite->log);
+
+	if (suite->log)
+		string_stream_clear(suite->log);
 }
 
 bool kunit_enabled(void)
-- 
2.30.2