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

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Date:   Wed, 13 Jul 2022 01:54:41 +0800
From:   Yujie Liu <yujie.liu@...el.com>
To:     David Gow <davidgow@...gle.com>
CC:     <kunit-dev@...glegroups.com>, <linux-kselftest@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        <llvm@...ts.linux.dev>, Shuah Khan <skhan@...uxfoundation.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Daniel Latypov <dlatypov@...gle.com>
Subject: Re: [PATCH] kunit: executor: Fix a memory leak on failure in
 kunit_filter_tests

Hi David,

On 7/12/2022 17:56, David Gow wrote:
> It's possible that memory allocation for the copy will fail, but for the

I think it is "for the _filtered_ will fail". Maybe a typo?

Thanks,
Yujie

> 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/
> 
> Fixes: a02353f49162 ("kunit: bail out of test filtering logic quicker if OOM")
> Reported-by: kernel test robot <yujie.liu@...el.com>
> Signed-off-by: David Gow <davidgow@...gle.com>
> ---
>   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) {