linux-kernel - [PATCH 2/4] scsi: mpi3mr: struct mpi3_event_data_pcie_topology_change_list: Replace 1-element array with flexible array

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Message-Id: <20240711155637.3757036-2-kees@kernel.org>
Date: Thu, 11 Jul 2024 08:56:34 -0700
From: Kees Cook <kees@...nel.org>
To: Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>
Cc: Kees Cook <kees@...nel.org>,
	Kashyap Desai <kashyap.desai@...adcom.com>,
	Sumit Saxena <sumit.saxena@...adcom.com>,
	Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Ranjan Kumar <ranjan.kumar@...adcom.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	mpi3mr-linuxdrv.pdl@...adcom.com,
	linux-scsi@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] scsi: mpi3mr: struct mpi3_event_data_pcie_topology_change_list: Replace 1-element array with flexible array

Replace the deprecated[1] use of a 1-element array in
struct mpi3_event_data_pcie_topology_change_list with a modern
flexible array.

Additionally add __counted_by annotation since port_entry is only ever
accessed in loops controlled by num_entries. For example:

        for (i = 0; i < event_data->num_entries; i++) {
                handle =
                    le16_to_cpu(event_data->port_entry[i].attached_dev_handle);

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 Veerichetty <sathya.prakash@...adcom.com>
Cc: Kashyap Desai <kashyap.desai@...adcom.com>
Cc: Sumit Saxena <sumit.saxena@...adcom.com>
Cc: Sreekanth Reddy <sreekanth.reddy@...adcom.com>
Cc: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Ranjan Kumar <ranjan.kumar@...adcom.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: mpi3mr-linuxdrv.pdl@...adcom.com
Cc: linux-scsi@...r.kernel.org
Cc: linux-hardening@...r.kernel.org
---
 drivers/scsi/mpi3mr/mpi/mpi30_ioc.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/scsi/mpi3mr/mpi/mpi30_ioc.h b/drivers/scsi/mpi3mr/mpi/mpi30_ioc.h
index ae74fccc65b8..c9fa0d69b75f 100644
--- a/drivers/scsi/mpi3mr/mpi/mpi30_ioc.h
+++ b/drivers/scsi/mpi3mr/mpi/mpi30_ioc.h
@@ -542,9 +542,6 @@ struct mpi3_event_data_pcie_enumeration {
 #define MPI3_EVENT_PCIE_ENUM_ES_MAX_SWITCHES_EXCEED         (0x40000000)
 #define MPI3_EVENT_PCIE_ENUM_ES_MAX_DEVICES_EXCEED          (0x20000000)
 #define MPI3_EVENT_PCIE_ENUM_ES_RESOURCES_EXHAUSTED         (0x10000000)
-#ifndef MPI3_EVENT_PCIE_TOPO_PORT_COUNT
-#define MPI3_EVENT_PCIE_TOPO_PORT_COUNT         (1)
-#endif
 struct mpi3_event_pcie_topo_port_entry {
 	__le16             attached_dev_handle;
 	u8                 port_status;
@@ -585,7 +582,7 @@ struct mpi3_event_data_pcie_topology_change_list {
 	u8                                     switch_status;
 	u8                                     io_unit_port;
 	__le32                                 reserved0c;
-	struct mpi3_event_pcie_topo_port_entry     port_entry[MPI3_EVENT_PCIE_TOPO_PORT_COUNT];
+	struct mpi3_event_pcie_topo_port_entry     port_entry[] __counted_by(num_entries);
 };
 
 #define MPI3_EVENT_PCIE_TOPO_SS_NO_PCIE_SWITCH          (0x00)
-- 
2.34.1