Re: [PATCH 08/11] kasan: adopt kmalloc_uaf2 test to HW_TAGS mode

[Alexander Potapenko <glider@xxxxxxxxxx>]

Nit: s/adopt/adapt in the title.


> +again:
>         ptr1 = kmalloc(size, GFP_KERNEL);
>         KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
>
> @@ -384,6 +386,13 @@ static void kmalloc_uaf2(struct kunit *test)
>         ptr2 = kmalloc(size, GFP_KERNEL);
>         KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
>
> +       /*
> +        * For tag-based KASAN ptr1 and ptr2 tags might happen to be the same.
> +        * Allow up to 4 attempts at generating different tags.
> +        */
> +       if (!IS_ENABLED(CONFIG_KASAN_GENERIC) && ptr1 == ptr2 && counter++ < 4)
> +               goto again;
> +

Looks like we are leaking memory allocated for ptr2 here?