linux-kernel - [PATCH] scsi: aacraid: avoid -Warray-bounds warning

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Date:   Mon,  3 Jul 2023 13:48:46 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Sagar Biradar <sagar.biradar@...rochip.com>,
        John Garry <john.g.garry@...cle.com>,
        Gilbert Wu <gilbert.wu@...rochip.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: aacraid: avoid -Warray-bounds warning

From: Arnd Bergmann <arnd@...db.de>

The one-element array in aac_aifcmd is actually meant as a flexible array,
and causes an overflow warning that can be avoided using the normal
flex arrays:

drivers/scsi/aacraid/commsup.c:1166:17: error: array index 1 is past the end of the array (that has type 'u8[1]' (aka 'unsigned char[1]'), cast to '__le32 *' (aka 'unsigned int *')) [-Werror,-Warray-bounds]
                                (((__le32 *)aifcmd->data)[1] == cpu_to_le32(3));
                                            ^             ~

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/scsi/aacraid/aacraid.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index 7c6efde75da66..73b6ac0c01f54 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -2618,7 +2618,7 @@ struct aac_hba_info {
 struct aac_aifcmd {
 	__le32 command;		/* Tell host what type of notify this is */
 	__le32 seqnum;		/* To allow ordering of reports (if necessary) */
-	u8 data[1];		/* Undefined length (from kernel viewpoint) */
+	u8 data[];		/* Undefined length (from kernel viewpoint) */
 };
 
 /**
-- 
2.39.2