linux-kernel - [PATCH] tomoyo: fix clang pointer arithmetic warning

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Date:   Mon, 26 Oct 2020 22:52:31 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Kentaro Takeda <takedakn@...data.co.jp>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Toshiharu Harada <haradats@...data.co.jp>
Cc:     Arnd Bergmann <arnd@...db.de>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: [PATCH] tomoyo: fix clang pointer arithmetic warning

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

clang warns about additions on NULL pointers being undefined in C:

security/tomoyo/securityfs_if.c:226:59: warning: arithmetic on a null pointer treated as a cast from integer to pointer is a GNU extension [-Wnull-pointer-arithmetic]
        securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,

Change the code to instead use a cast through uintptr_t to avoid
the warning.

Fixes: 9590837b89aa ("Common functions for TOMOYO Linux.")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 security/tomoyo/securityfs_if.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/tomoyo/securityfs_if.c b/security/tomoyo/securityfs_if.c
index 546281c5b233..0a5f00073ef1 100644
--- a/security/tomoyo/securityfs_if.c
+++ b/security/tomoyo/securityfs_if.c
@@ -223,7 +223,7 @@ static const struct file_operations tomoyo_operations = {
 static void __init tomoyo_create_entry(const char *name, const umode_t mode,
 				       struct dentry *parent, const u8 key)
 {
-	securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
+	securityfs_create_file(name, mode, parent, (u8 *)(uintptr_t)key,
 			       &tomoyo_operations);
 }
 
-- 
2.27.0