linux-hardening - [PATCH][next] s390/diag: Replace zero-length array with flexible-array member

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Date:   Thu, 6 Apr 2023 08:28:42 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] s390/diag: Replace zero-length array with
 flexible-array member

Zero-length arrays are deprecated [1] and have to be replaced by C99
flexible-array members.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines
on memcpy() and help to make progress towards globally enabling
-fstrict-flex-arrays=3 [2]

Link: https://github.com/KSPP/linux/issues/78 [1]
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 arch/s390/include/asm/diag.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/include/asm/diag.h b/arch/s390/include/asm/diag.h
index 674a939f16ee..902e0330dd91 100644
--- a/arch/s390/include/asm/diag.h
+++ b/arch/s390/include/asm/diag.h
@@ -90,7 +90,7 @@ struct diag8c {
 	u8 num_partitions;
 	u16 width;
 	u16 height;
-	u8 data[0];
+	u8 data[];
 } __packed __aligned(4);
 
 extern int diag8c(struct diag8c *out, struct ccw_dev_id *devno);
-- 
2.34.1