linux-kernel - [PATCH] kasan: use %zd format for printing size

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Date:   Wed,  1 Feb 2023 08:13:04 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marco Elver <elver@...gle.com>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] kasan: use %zd format for printing size_t

From: Arnd Bergmann <arnd@...db.de>

The size_t type depends on the architecture, so %lu does not work
on most 32-bit ones:

In file included from include/kunit/assert.h:13,
                 from include/kunit/test.h:12,
                 from mm/kasan/report.c:12:
mm/kasan/report.c: In function 'describe_object_addr':
include/linux/kern_levels.h:5:25: error: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
mm/kasan/report.c:270:9: note: in expansion of macro 'pr_err'
  270 |         pr_err("The buggy address is located %d bytes %s of\n"
      |         ^~~~~~

Fixes: 0e301731f558 ("kasan: infer allocation size by scanning metadata")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 mm/kasan/report.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index e0492124e90a..89078f912827 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -268,7 +268,7 @@ static void describe_object_addr(const void *addr, struct kasan_report_info *inf
 	}
 
 	pr_err("The buggy address is located %d bytes %s of\n"
-	       " %s%lu-byte region [%px, %px)\n",
+	       " %s%zu-byte region [%px, %px)\n",
 	       rel_bytes, rel_type, region_state, info->alloc_size,
 	       (void *)object_addr, (void *)(object_addr + info->alloc_size));
 }
-- 
2.39.0