linux-kernel - [PATCH v2] kunit: executor: Fix a memory leak on failure in kunit_filter

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Date:   Wed, 13 Jul 2022 07:25:27 +0800
From:   David Gow <davidgow@...gle.com>
To:     Daniel Latypov <dlatypov@...gle.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Shuah Khan <skhan@...uxfoundation.org>
Cc:     David Gow <davidgow@...gle.com>, kunit-dev@...glegroups.com,
        linux-kselftest@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        llvm@...ts.linux.dev, kernel test robot <yujie.liu@...el.com>,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH v2] kunit: executor: Fix a memory leak on failure in kunit_filter_tests

It's possible that memory allocation for 'filtered' will fail, but for the
copy of the suite to succeed. In this case, the copy could be leaked.

Properly free 'copy' in the error case for the allocation of 'filtered'
failing.

Note that there may also have been a similar issue in
kunit_filter_subsuites, before it was removed in "kunit: flatten
kunit_suite*** to kunit_suite** in .kunit_test_suites".

This was reported by clang-analyzer via the kernel test robot, here:
https://lore.kernel.org/all/c8073b8e-7b9e-0830-4177-87c12f16349c@intel.com/

And by smatch via Dan Carpenter and the kernel test robot:
https://lore.kernel.org/all/202207101328.ASjx88yj-lkp@intel.com/

Fixes: a02353f49162 ("kunit: bail out of test filtering logic quicker if OOM")
Reported-by: kernel test robot <yujie.liu@...el.com>
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Daniel Latypov <dlatypov@...gle.com>
Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
Signed-off-by: David Gow <davidgow@...gle.com>
---

Thanks everyone! No actual code changes in v2, just fixes to the
description.

Changes since v1:
https://lore.kernel.org/all/20220712095627.1770312-1-davidgow@google.com/
- Fix a mistake in the commit description where we noted the allocation
  for 'copy' could fail, instead of 'filtered'. (Thanks Yujie!)
- Noted in the description that smatch also found this (Thanks Dan!)
- Added the extra Reported-by and Reviewed-by tags.

---
 lib/kunit/executor.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
index 6c489d6c5e5d..5e223327196a 100644
--- a/lib/kunit/executor.c
+++ b/lib/kunit/executor.c
@@ -74,8 +74,10 @@ kunit_filter_tests(const struct kunit_suite *const suite, const char *test_glob)
 		return ERR_PTR(-ENOMEM);
 
 	filtered = kcalloc(n + 1, sizeof(*filtered), GFP_KERNEL);
-	if (!filtered)
+	if (!filtered) {
+		kfree(copy);
 		return ERR_PTR(-ENOMEM);
+	}
 
 	n = 0;
 	kunit_suite_for_each_test_case(suite, test_case) {
-- 
2.37.0.144.g8ac04bfd2-goog