uapi/linux/stddef.h: Add include guards

BugLink: https://bugs.launchpad.net/bugs/1987451
[ Upstream commit 55037ed7bdc62151a726f5685f88afa6a82959b1 ]

Add include guard wrapper define to uapi/linux/stddef.h to prevent macro
redefinition errors when stddef.h is included more than once. This was not
needed before since the only contents already used a redefinition test.

Signed-off-by: Tadeusz Struk <tadeusz.struk@linaro.org>
Link: https://lore.kernel.org/r/20220329171252.57279-1-tadeusz.struk@linaro.org
Fixes: 50d7bd38c3aa ("stddef: Introduce struct_group() helper macro")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/include/uapi/linux/stddef.h b/include/uapi/linux/stddef.h
index 3021ea25a2849ed351c0c064fdf4a4780a9f7b29..7837ba4fe7289024c10942a7793411e0e3b27e7f 100644 (file)
--- a/include/uapi/linux/stddef.h
+++ b/include/uapi/linux/stddef.h
@@ -1,4 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_LINUX_STDDEF_H
+#define _UAPI_LINUX_STDDEF_H
+
 #include <linux/compiler_types.h>
 
 #ifndef __always_inline
@@ -41,3 +44,4 @@
                struct { } __empty_ ## NAME; \
                TYPE NAME[]; \
        }
+#endif