linux-hardening - [PATCH] scsi: pm8001: Replace one-element array with flexible-array member

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Message-ID: <Yyy31OuBza1FJCXP@work>
Date:   Thu, 22 Sep 2022 14:30:28 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Jack Wang <jinpu.wang@...ud.ionos.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH] scsi: pm8001: Replace one-element array with flexible-array
 member

One-element arrays are deprecated, and we are replacing them with flexible
array members instead. So, replace one-element array with flexible-array
member in struct fw_control_info.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [1].

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/207
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/scsi/pm8001/pm8001_sas.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h
index c5e3f380a01c..b08f52673889 100644
--- a/drivers/scsi/pm8001/pm8001_sas.h
+++ b/drivers/scsi/pm8001/pm8001_sas.h
@@ -612,7 +612,7 @@ struct fw_control_info {
 	operations.*/
 	u32			reserved;/* padding required for 64 bit
 	alignment */
-	u8			buffer[1];/* Start of buffer */
+	u8			buffer[];/* Start of buffer */
 };
 struct fw_control_ex {
 	struct fw_control_info *fw_control;
-- 
2.34.1