linux-kernel - [PATCH RESEND] kunit: debugfs: Fix unchecked dereference in debugfs_print

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Date:   Mon, 30 Oct 2023 10:47:58 +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>,
        Dan Carpenter <dan.carpenter@...aro.org>
Subject: [PATCH RESEND] kunit: debugfs: Fix unchecked dereference in debugfs_print_results()

Move the call to kunit_suite_has_succeeded() after the check that
the kunit_suite pointer is valid.

This was found by smatch:

 lib/kunit/debugfs.c:66 debugfs_print_results() warn: variable
 dereferenced before check 'suite' (see line 63)

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Fixes: 38289a26e1b8 ("kunit: fix debugfs code to use enum kunit_status, not bool")
---
 lib/kunit/debugfs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/kunit/debugfs.c b/lib/kunit/debugfs.c
index 9d167adfa746..382706dfb47d 100644
--- a/lib/kunit/debugfs.c
+++ b/lib/kunit/debugfs.c
@@ -60,12 +60,14 @@ static void debugfs_print_result(struct seq_file *seq, struct string_stream *log
 static int debugfs_print_results(struct seq_file *seq, void *v)
 {
 	struct kunit_suite *suite = (struct kunit_suite *)seq->private;
-	enum kunit_status success = kunit_suite_has_succeeded(suite);
+	enum kunit_status success;
 	struct kunit_case *test_case;
 
 	if (!suite)
 		return 0;
 
+	success = kunit_suite_has_succeeded(suite);
+
 	/* Print KTAP header so the debugfs log can be parsed as valid KTAP. */
 	seq_puts(seq, "KTAP version 1\n");
 	seq_puts(seq, "1..1\n");
-- 
2.30.2