linux-kernel - Re: [PATCH v2] kunit: fix bug in KUNIT_EXPECT

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Date:   Sat, 28 Jan 2023 15:57:21 +0800
From:   David Gow <davidgow@...gle.com>
To:     Rae Moar <rmoar@...gle.com>
Cc:     brendanhiggins@...gle.com, dlatypov@...gle.com,
        skhan@...uxfoundation.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2] kunit: fix bug in KUNIT_EXPECT_MEMEQ

On Sat, 28 Jan 2023 at 04:40, Rae Moar <rmoar@...gle.com> wrote:
>
> In KUNIT_EXPECT_MEMEQ and KUNIT_EXPECT_MEMNEQ, add check if one of the
> inputs is NULL and fail if this is the case.
>
> Currently, the kernel crashes if one of the inputs is NULL. Instead,
> fail the test and add an appropriate error message.
>
> Fixes: b8a926bea8b1 ("kunit: Introduce KUNIT_EXPECT_MEMEQ and KUNIT_EXPECT_MEMNEQ macros")
>
> This was found by the kernel test robot:
> https://lore.kernel.org/all/202212191448.D6EDPdOh-lkp@intel.com/
>
> Reported-by: kernel test robot <lkp@...el.com>
>
> Signed-off-by: Rae Moar <rmoar@...gle.com>
> Reviewed-by: David Gow <davidgow@...gle.com>
> ---
>
> Changes since v1:
> - Fix formatting of backslashes
> - Add Fixes: ... statement to commit message
>

Looks good to me, now.

Thanks.
— David

>  include/kunit/test.h |  5 +++--
>  lib/kunit/assert.c   | 40 +++++++++++++++++++++++++---------------
>  2 files changed, 28 insertions(+), 17 deletions(-)
>
> diff --git a/include/kunit/test.h b/include/kunit/test.h
> index 87ea90576b50..a20bff149bdf 100644
> --- a/include/kunit/test.h
> +++ b/include/kunit/test.h
> @@ -683,8 +683,9 @@ do {                                                                               \
>                 .right_text = #right,                                          \
>         };                                                                     \
>                                                                                \
> -       if (likely(memcmp(__left, __right, __size) op 0))                      \
> -               break;                                                         \
> +       if (likely(__left && __right))                                         \
> +               if (likely(memcmp(__left, __right, __size) op 0))              \
> +                       break;                                                 \
>                                                                                \
>         _KUNIT_FAILED(test,                                                    \
>                       assert_type,                                             \
> diff --git a/lib/kunit/assert.c b/lib/kunit/assert.c
> index f5b50babe38d..05a09652f5a1 100644
> --- a/lib/kunit/assert.c
> +++ b/lib/kunit/assert.c
> @@ -241,24 +241,34 @@ void kunit_mem_assert_format(const struct kunit_assert *assert,
>         mem_assert = container_of(assert, struct kunit_mem_assert,
>                                   assert);
>
> -       string_stream_add(stream,
> -                         KUNIT_SUBTEST_INDENT "Expected %s %s %s, but\n",
> -                         mem_assert->text->left_text,
> -                         mem_assert->text->operation,
> -                         mem_assert->text->right_text);
> +       if (!mem_assert->left_value) {
> +               string_stream_add(stream,
> +                                 KUNIT_SUBTEST_INDENT "Expected %s is not null, but is\n",
> +                                 mem_assert->text->left_text);
> +       } else if (!mem_assert->right_value) {
> +               string_stream_add(stream,
> +                                 KUNIT_SUBTEST_INDENT "Expected %s is not null, but is\n",
> +                                 mem_assert->text->right_text);
> +       } else {
> +               string_stream_add(stream,
> +                               KUNIT_SUBTEST_INDENT "Expected %s %s %s, but\n",
> +                               mem_assert->text->left_text,
> +                               mem_assert->text->operation,
> +                               mem_assert->text->right_text);
>
> -       string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s ==\n",
> -                         mem_assert->text->left_text);
> -       kunit_assert_hexdump(stream, mem_assert->left_value,
> -                            mem_assert->right_value, mem_assert->size);
> +               string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s ==\n",
> +                               mem_assert->text->left_text);
> +               kunit_assert_hexdump(stream, mem_assert->left_value,
> +                                       mem_assert->right_value, mem_assert->size);
>
> -       string_stream_add(stream, "\n");
> +               string_stream_add(stream, "\n");
>
> -       string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s ==\n",
> -                         mem_assert->text->right_text);
> -       kunit_assert_hexdump(stream, mem_assert->right_value,
> -                            mem_assert->left_value, mem_assert->size);
> +               string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s ==\n",
> +                               mem_assert->text->right_text);
> +               kunit_assert_hexdump(stream, mem_assert->right_value,
> +                                       mem_assert->left_value, mem_assert->size);
>
> -       kunit_assert_print_msg(message, stream);
> +               kunit_assert_print_msg(message, stream);
> +       }
>  }
>  EXPORT_SYMBOL_GPL(kunit_mem_assert_format);
>
> base-commit: 5835ffc27381c2d32c3f0d7b575cb3397555ab47
> --
> 2.39.1.456.gfc5497dd1b-goog
>

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