[PATCH][next] kunit: fix dereference of suite before it has been null checked

From: Colin King <colin.king@canonical.com>
To: Brendan Higgins <brendanhiggins@google.com>,
	Frank Rowand <frank.rowand@sony.com>,
	Shuah Khan <skhan@linuxfoundation.org>,
	Alan Maguire <alan.maguire@oracle.com>,
	linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH][next] kunit: fix dereference of suite before it has been null checked
Date: Thu,  2 Apr 2020 16:03:14 +0100	[thread overview]
Message-ID: <20200402150314.568044-1-colin.king@canonical.com> (raw)

From: Colin Ian King <colin.king@canonical.com>

Currently pointer 'suite' is dereferenced when variable success
is being initialized before the pointer is null checked. Fix this
by only dereferencing suite after is has been null checked.

Addresses-Coverity: ("Dereference before null check")
Fixes: e2219db280e3 ("kunit: add debugfs /sys/kernel/debug/kunit/<suite>/results display")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 lib/kunit/debugfs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/kunit/debugfs.c b/lib/kunit/debugfs.c
index 9214c493d8b7..05547642f37c 100644
--- a/lib/kunit/debugfs.c
+++ b/lib/kunit/debugfs.c
@@ -52,12 +52,13 @@ static void debugfs_print_result(struct seq_file *seq,
 static int debugfs_print_results(struct seq_file *seq, void *v)
 {
 	struct kunit_suite *suite = (struct kunit_suite *)seq->private;
-	bool success = kunit_suite_has_succeeded(suite);
+	bool success;
 	struct kunit_case *test_case;
 
 	if (!suite || !suite->log)
 		return 0;
 
+	success = kunit_suite_has_succeeded(suite);
 	seq_printf(seq, "%s", suite->log);
 
 	kunit_suite_for_each_test_case(suite, test_case)
-- 
2.25.1

