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Message-ID: <CABVgOSkaBJE1FMSquPaZ=5ULFLyfrkMYKixn0YLZZJAtKoNG_g@mail.gmail.com>
Date: Wed, 25 Jan 2023 14:38:08 +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 v1] kunit: fix bug in KUNIT_EXPECT_MEMEQ
On Wed, 25 Jan 2023 at 14:19, 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.
>
> 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>
> ---
This looks good to me, modulo a small formatting issue with the
continuation backslashes (see below).
It might be worth considering this as a fix to the patch which first
introduced the MEMEQ macros with a Fixes tag, e.g.:
Fixes: b8a926bea8b1 ("kunit: Introduce KUNIT_EXPECT_MEMEQ and
KUNIT_EXPECT_MEMNEQ macros")
Otherwise, this is:
Reviewed-by: David Gow <davidgow@...gle.com>
Cheers,
-- David
> include/kunit/test.h | 7 ++++---
> lib/kunit/assert.c | 40 +++++++++++++++++++++++++---------------
> 2 files changed, 29 insertions(+), 18 deletions(-)
>
> diff --git a/include/kunit/test.h b/include/kunit/test.h
> index 87ea90576b50..3c7045e22512 100644
> --- a/include/kunit/test.h
> +++ b/include/kunit/test.h
> @@ -683,9 +683,10 @@ 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; \
> + \
The backslashes no longer line up here.
> _KUNIT_FAILED(test, \
> assert_type, \
> kunit_mem_assert, \
> 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: 5cb26c298ffde271d9bd1dd1b87ad028218f77fe
> --
> 2.39.1.405.gd4c25cc71f-goog
>
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