linux-hardening - [PATCH] powerpc/rtas: Replace one-element arrays with flexible arrays

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Date:   Fri, 27 Jan 2023 19:50:23 +1100
From:   Andrew Donnellan <ajd@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     Nathan Lynch <nathanl@...ux.ibm.com>,
        Leonardo Bras <leobras.c@...il.com>,
        linux-hardening@...r.kernel.org
Subject: [PATCH] powerpc/rtas: Replace one-element arrays with flexible arrays

Using a one-element array as a fake flexible array is deprecated.

Replace the one-element flexible arrays in rtas-types.h with C99 standard
flexible array members instead.

This helps us move towards enabling -fstrict-flex-arrays=3 in future.

Found using scripts/coccinelle/misc/flexible_array.cocci.

Cc: Nathan Lynch <nathanl@...ux.ibm.com>
Cc: Leonardo Bras <leobras.c@...il.com>
Cc: linux-hardening@...r.kernel.org
Link: https://github.com/KSPP/linux/issues/21
Link: https://github.com/KSPP/linux/issues/79
Signed-off-by: Andrew Donnellan <ajd@...ux.ibm.com>
---
 arch/powerpc/include/asm/rtas-types.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/rtas-types.h b/arch/powerpc/include/asm/rtas-types.h
index 8df6235d64d1..40ec03a05c0b 100644
--- a/arch/powerpc/include/asm/rtas-types.h
+++ b/arch/powerpc/include/asm/rtas-types.h
@@ -44,7 +44,7 @@ struct rtas_error_log {
 	 */
 	u8		byte3;			/* General event or error*/
 	__be32		extended_log_length;	/* length in bytes */
-	unsigned char	buffer[1];		/* Start of extended log */
+	unsigned char	buffer[];		/* Start of extended log */
 						/* Variable length.      */
 };
 
@@ -85,7 +85,7 @@ struct rtas_ext_event_log_v6 {
 					/* that defines the format for	*/
 					/* the vendor specific log type	*/
 	/* Byte 16-end of log */
-	u8 vendor_log[1];		/* Start of vendor specific log	*/
+	u8 vendor_log[];		/* Start of vendor specific log	*/
 					/* Variable length.		*/
 };
 
-- 
2.39.1