linux-kernel - [PATCH] scsi: megaraid_sas: Convert union megasas

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Message-Id: <20230511220957.never.919-kees@kernel.org>
Date:   Thu, 11 May 2023 15:10:00 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Kashyap Desai <kashyap.desai@...adcom.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] scsi: megaraid_sas: Convert union megasas_sgl to flex-arrays

In the ongoing effort to replace all fake flexible arrays with true
flexible arrays, replace the sge32, sge64, and sge_skinny members of
union megasas_sgl with true flexible arrays. No binary differences are
seen after this change; sizes were already being manually calculated
using the member struct sizes directly.

Cc: Kashyap Desai <kashyap.desai@...adcom.com>
Cc: Sumit Saxena <sumit.saxena@...adcom.com>
Cc: Shivasharan S <shivasharan.srikanteshwara@...adcom.com>
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: Gustavo A. R. Silva <gustavoars@...nel.org>
Cc: megaraidlinux.pdl@...adcom.com
Cc: linux-scsi@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/scsi/megaraid/megaraid_sas.h | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 63bac3684c19..3554f6b07727 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -1722,11 +1722,9 @@ struct megasas_sge_skinny {
 } __packed;
 
 union megasas_sgl {
-
-	struct megasas_sge32 sge32[1];
-	struct megasas_sge64 sge64[1];
-	struct megasas_sge_skinny sge_skinny[1];
-
+	DECLARE_FLEX_ARRAY(struct megasas_sge32, sge32);
+	DECLARE_FLEX_ARRAY(struct megasas_sge64, sge64);
+	DECLARE_FLEX_ARRAY(struct megasas_sge_skinny, sge_skinny);
 } __attribute__ ((packed));
 
 struct megasas_header {
-- 
2.34.1