Re: [PATCH] lib/test_meminit: add checks for the allocation functions

[Alexander Potapenko <glider@google.com>]

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On Fri, Mar 4, 2022 at 10:13 AM <xkernel.wang@foxmail.com> wrote:

> From: Xiaoke Wang <xkernel.wang@foxmail.com>
>
> alloc_pages(), kmalloc() and vmalloc() are all memory allocation
> functions which can return NULL when some internal memory failures
> happen. So it is better to check the return of them to catch the failure
> in time for better test them.
>
> Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com>
>
Reviewed-by: Alexander Potapenko <glider@google.com>

> ---
>  lib/test_meminit.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>
> diff --git a/lib/test_meminit.c b/lib/test_meminit.c
> index e4f706a..2f4c4bc 100644
> --- a/lib/test_meminit.c
> +++ b/lib/test_meminit.c
> @@ -67,17 +67,24 @@ static int __init do_alloc_pages_order(int order, int
> *total_failures)
>         size_t size = PAGE_SIZE << order;
>
>         page = alloc_pages(GFP_KERNEL, order);
> +       if (!page)
> +               goto err;
>         buf = page_address(page);
>         fill_with_garbage(buf, size);
>         __free_pages(page, order);
>
>         page = alloc_pages(GFP_KERNEL, order);
> +       if (!page)
> +               goto err;
>         buf = page_address(page);
>         if (count_nonzero_bytes(buf, size))
>                 (*total_failures)++;
>         fill_with_garbage(buf, size);
>         __free_pages(page, order);
>         return 1;
> +err:
> +       (*total_failures)++;
> +       return 1;
>  }
>
>  /* Test the page allocator by calling alloc_pages with different orders.
> */
> @@ -100,15 +107,22 @@ static int __init do_kmalloc_size(size_t size, int
> *total_failures)
>         void *buf;
>
>         buf = kmalloc(size, GFP_KERNEL);
> +       if (!buf)
> +               goto err;
>         fill_with_garbage(buf, size);
>         kfree(buf);
>
>         buf = kmalloc(size, GFP_KERNEL);
> +       if (!buf)
> +               goto err;
>         if (count_nonzero_bytes(buf, size))
>                 (*total_failures)++;
>         fill_with_garbage(buf, size);
>         kfree(buf);
>         return 1;
> +err:
> +       (*total_failures)++;
> +       return 1;
>  }
>
>  /* Test vmalloc() with given parameters. */
> @@ -117,15 +131,22 @@ static int __init do_vmalloc_size(size_t size, int
> *total_failures)
>         void *buf;
>
>         buf = vmalloc(size);
> +       if (!buf)
> +               goto err;
>         fill_with_garbage(buf, size);
>         vfree(buf);
>
>         buf = vmalloc(size);
> +       if (!buf)
> +               goto err;
>         if (count_nonzero_bytes(buf, size))
>                 (*total_failures)++;
>         fill_with_garbage(buf, size);
>         vfree(buf);
>         return 1;
> +err:
> +       (*total_failures)++;
> +       return 1;
>  }
>
>  /* Test kmalloc()/vmalloc() by allocating objects of different sizes. */
> --
>


-- 
Alexander Potapenko
Software Engineer

Google Germany GmbH
Erika-Mann-Straße, 33
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