linux-kernel - [PATCH 11/20] ACPICA: Headers: Replace zero-length array with flexible-array member

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Message-ID: <5732090.MhkbZ0Pkbq@kreacher>
Date:   Mon, 11 Apr 2022 20:56:15 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Bob Moore <robert.moore@...el.com>
Subject: [PATCH 11/20] ACPICA: Headers: Replace zero-length array with flexible-array member

From: Gustavo A. R. Silva <gustavoars@...nel.org>

ACPICA commit 98835f452c698b015d4da999944405ecb90da670

There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/acpica/acpica/commit/98835f45
Link: https://github.com/KSPP/linux/issues/78
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Bob Moore <robert.moore@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 include/acpi/actbl2.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-pm/include/acpi/actbl2.h
===================================================================
--- linux-pm.orig/include/acpi/actbl2.h
+++ linux-pm/include/acpi/actbl2.h
@@ -2310,7 +2310,7 @@ struct acpi_table_rgrt {
 	u16 version;
 	u8 image_type;
 	u8 reserved;
-	u8 image[0];
+	u8 image[];
 };
 
 /* image_type values */