linux-kernel - [PATCH 5.15 042/317] lib/cmdline: Fix an invalid format specifier in an assertion msg

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Date: Sun, 24 Mar 2024 19:30:22 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: David Gow <davidgow@...gle.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Daniel Latypov <dlatypov@...gle.com>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 042/317] lib/cmdline: Fix an invalid format specifier in an assertion msg

From: David Gow <davidgow@...gle.com>

[ Upstream commit d2733a026fc7247ba42d7a8e1b737cf14bf1df21 ]

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>
Reviewed-by: Daniel Latypov <dlatypov@...gle.com>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 a72a2c16066ef..de7fb7476cb9a 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)
-- 
2.43.0