On Thu, Sep 9, 2021 at 1:28 PM 'Xiyu Yang' via KUnit Development
<kunit-dev@xxxxxxxxxxxxxxxx> wrote:
>
> The reference counting issue happens in the normal path of
> kfree_at_end(). When kunit_alloc_and_get_resource() is invoked, the
> function forgets to handle the returned resource object, whose refcount
> increased inside, causing a refcount leak.
>
> Fix this issue by calling kunit_put_resource() at the end of function.
>
> Signed-off-by: Xiyu Yang <xiyuyang19@xxxxxxxxxxxx>
> Signed-off-by: Xin Tan <tanxin.ctf@xxxxxxxxx>
> ---
Thanks for looking into this.
+ Daniel -- any thoughts?
> lib/kunit/executor_test.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/lib/kunit/executor_test.c b/lib/kunit/executor_test.c
> index cdbe54b16501..3af30abad826 100644
> --- a/lib/kunit/executor_test.c
> +++ b/lib/kunit/executor_test.c
> @@ -113,11 +113,13 @@ static void kfree_res_free(struct kunit_resource *res)
> */
> static void kfree_at_end(struct kunit *test, const void *to_free)
> {
> + struct kunit_resource *res;
> /* kfree() handles NULL already, but avoid allocating a no-op cleanup. */
> if (IS_ERR_OR_NULL(to_free))
> return;
> - kunit_alloc_and_get_resource(test, NULL, kfree_res_free, GFP_KERNEL,
> + res = kunit_alloc_and_get_resource(test, NULL, kfree_res_free, GFP_KERNEL,
> (void *)to_free);
> + kunit_put_resource(res);
Why not just change this to kunit_alloc_resource()?
> }
>
> static struct kunit_suite *alloc_fake_suite(struct kunit *test,
> --
> 2.7.4
>
> --
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