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Message-ID: <293a2156-6e0e-4e80-b31e-5d553e63b707@roeck-us.net>
Date: Wed, 21 Feb 2024 05:25:38 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: David Gow <davidgow@...gle.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Shuah Khan <skhan@...uxfoundation.org>, Rae Moar <rmoar@...gle.com>,
Matthew Auld <matthew.auld@...el.com>,
Arunpravin Paneer Selvam <arunpravin.paneerselvam@....com>,
Christian König <christian.koenig@....com>,
Kees Cook <keescook@...omium.org>,
Maíra Canal <mcanal@...lia.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Matthew Brost <matthew.brost@...el.com>,
Willem de Bruijn <willemb@...gle.com>,
Florian Westphal <fw@...len.de>,
Cassio Neri <cassio.neri@...il.com>,
Javier Martinez Canillas <javierm@...hat.com>,
Arthur Grillo <arthur.grillo@....br>,
Brendan Higgins <brendan.higgins@...ux.dev>,
Daniel Latypov <dlatypov@...gle.com>,
Stephen Boyd <sboyd@...nel.org>, David Airlie <airlied@...il.com>,
Maxime Ripard <mripard@...nel.org>,
"David S . Miller" <davem@...emloft.net>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
intel-xe@...ts.freedesktop.org, linux-rtc@...r.kernel.org,
linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
linux-hardening@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/9] lib/cmdline: Fix an invalid format specifier in an
assertion msg
On Wed, Feb 21, 2024 at 05:27:15PM +0800, David Gow wrote:
> The correct format specifier for p - n (both p and n are pointers) is
> %td, as the type should be ptrdiff_t.
>
> This was discovered by annotating KUnit assertion macros with gcc's
> printf specifier, but note that gcc incorrectly suggested a %d or %ld
> specifier (depending on the pointer size of the architecture being
> built).
>
> Fixes: 0ea09083116d ("lib/cmdline: Allow get_options() to take 0 to validate the input")
> Signed-off-by: David Gow <davidgow@...gle.com>
Tested-by: Guenter Roeck <linux@...ck-us.net>
> ---
> lib/cmdline_kunit.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/cmdline_kunit.c b/lib/cmdline_kunit.c
> index d4572dbc9145..705b82736be0 100644
> --- a/lib/cmdline_kunit.c
> +++ b/lib/cmdline_kunit.c
> @@ -124,7 +124,7 @@ static void cmdline_do_one_range_test(struct kunit *test, const char *in,
> n, e[0], r[0]);
>
> p = memchr_inv(&r[1], 0, sizeof(r) - sizeof(r[0]));
> - KUNIT_EXPECT_PTR_EQ_MSG(test, p, NULL, "in test %u at %u out of bound", n, p - r);
> + KUNIT_EXPECT_PTR_EQ_MSG(test, p, NULL, "in test %u at %td out of bound", n, p - r);
> }
>
> static void cmdline_test_range(struct kunit *test)
> --
> 2.44.0.rc0.258.g7320e95886-goog
>
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