linux-kernel - [PATCH 5/6] scsi: message: fusion: struct _CONFIG_PAGE_IOC_3: Replace 1-element array with flexible array

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Message-Id: <20240711172821.123936-5-kees@kernel.org>
Date: Thu, 11 Jul 2024 10:28:19 -0700
From: Kees Cook <kees@...nel.org>
To: Sathya Prakash <sathya.prakash@...adcom.com>
Cc: Kees Cook <kees@...nel.org>,
	Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
	Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	MPT-FusionLinux.pdl@...adcom.com,
	linux-scsi@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/6] scsi: message: fusion: struct _CONFIG_PAGE_IOC_3: Replace 1-element array with flexible array

Replace the deprecated[1] use of a 1-element array in
struct _CONFIG_PAGE_IOC_3 with a modern flexible array.

Additionally add __counted_by annotation since PhysDisk is only ever
accessed via a loops bounded by NumPhysDisks:

lsi/mpi_cnfg.h:    IOC_3_PHYS_DISK             PhysDisk[] __counted_by(NumPhysDisks); /* 08h */
mptscsih.c:	for (i = 0; i < ioc->raid_data.pIocPg3->NumPhysDisks; i++) {
mptscsih.c:		if ((id == ioc->raid_data.pIocPg3->PhysDisk[i].PhysDiskID) &&
mptscsih.c:		    (channel == ioc->raid_data.pIocPg3->PhysDisk[i].PhysDiskBus)) {
mptscsih.c:	for (i = 0; i < ioc->raid_data.pIocPg3->NumPhysDisks; i++) {
mptscsih.c:		    ioc->raid_data.pIocPg3->PhysDisk[i].PhysDiskNum);
mptscsih.c:		    ioc->raid_data.pIocPg3->PhysDisk[i].PhysDiskNum,
mptscsih.c:	for (i = 0; i < ioc->raid_data.pIocPg3->NumPhysDisks; i++) {
mptscsih.c:		if ((id == ioc->raid_data.pIocPg3->PhysDisk[i].PhysDiskID) &&
mptscsih.c:		    (channel == ioc->raid_data.pIocPg3->PhysDisk[i].PhysDiskBus)) {
mptscsih.c:			rc = ioc->raid_data.pIocPg3->PhysDisk[i].PhysDiskNum;
mptscsih.c:	for (i = 0; i < ioc->raid_data.pIocPg3->NumPhysDisks; i++) {
mptscsih.c:		    ioc->raid_data.pIocPg3->PhysDisk[i].PhysDiskNum);
mptscsih.c:		    ioc->raid_data.pIocPg3->PhysDisk[i].PhysDiskNum,

No binary differences are present after this conversion.

Link: https://github.com/KSPP/linux/issues/79 [1]
Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: Sathya Prakash <sathya.prakash@...adcom.com>
Cc: Sreekanth Reddy <sreekanth.reddy@...adcom.com>
Cc: Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: MPT-FusionLinux.pdl@...adcom.com
Cc: linux-scsi@...r.kernel.org
Cc: linux-hardening@...r.kernel.org
---
 drivers/message/fusion/lsi/mpi_cnfg.h | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/message/fusion/lsi/mpi_cnfg.h b/drivers/message/fusion/lsi/mpi_cnfg.h
index 7713c74e515b..bac49c162165 100644
--- a/drivers/message/fusion/lsi/mpi_cnfg.h
+++ b/drivers/message/fusion/lsi/mpi_cnfg.h
@@ -1056,21 +1056,13 @@ typedef struct _IOC_3_PHYS_DISK
 } IOC_3_PHYS_DISK, MPI_POINTER PTR_IOC_3_PHYS_DISK,
   Ioc3PhysDisk_t, MPI_POINTER pIoc3PhysDisk_t;
 
-/*
- * Host code (drivers, BIOS, utilities, etc.) should leave this define set to
- * one and check Header.PageLength at runtime.
- */
-#ifndef MPI_IOC_PAGE_3_PHYSDISK_MAX
-#define MPI_IOC_PAGE_3_PHYSDISK_MAX         (1)
-#endif
-
 typedef struct _CONFIG_PAGE_IOC_3
 {
     CONFIG_PAGE_HEADER          Header;                                /* 00h */
     U8                          NumPhysDisks;                          /* 04h */
     U8                          Reserved1;                             /* 05h */
     U16                         Reserved2;                             /* 06h */
-    IOC_3_PHYS_DISK             PhysDisk[MPI_IOC_PAGE_3_PHYSDISK_MAX]; /* 08h */
+    IOC_3_PHYS_DISK             PhysDisk[] __counted_by(NumPhysDisks); /* 08h */
 } CONFIG_PAGE_IOC_3, MPI_POINTER PTR_CONFIG_PAGE_IOC_3,
   IOCPage3_t, MPI_POINTER pIOCPage3_t;
 
-- 
2.34.1