linux-hardening - [PATCH 1/4] scsi: mpi3mr: struct mpi3_event_data_sas_topology_change_list: Replace 1-element array with flexible array

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Message-Id: <20240711155637.3757036-1-kees@kernel.org>
Date: Thu, 11 Jul 2024 08:56:33 -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 1/4] scsi: mpi3mr: struct mpi3_event_data_sas_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_sas_topology_change_list with a modern
flexible array.

Additionally add __counted_by annotation since phy_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->phy_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 028784949873..ae74fccc65b8 100644
--- a/drivers/scsi/mpi3mr/mpi/mpi30_ioc.h
+++ b/drivers/scsi/mpi3mr/mpi/mpi30_ioc.h
@@ -453,9 +453,6 @@ struct mpi3_event_data_sas_notify_primitive {
 #define MPI3_EVENT_NOTIFY_PRIMITIVE_POWER_LOSS_EXPECTED   (0x02)
 #define MPI3_EVENT_NOTIFY_PRIMITIVE_RESERVED1             (0x03)
 #define MPI3_EVENT_NOTIFY_PRIMITIVE_RESERVED2             (0x04)
-#ifndef MPI3_EVENT_SAS_TOPO_PHY_COUNT
-#define MPI3_EVENT_SAS_TOPO_PHY_COUNT           (1)
-#endif
 struct mpi3_event_sas_topo_phy_entry {
 	__le16             attached_dev_handle;
 	u8                 link_rate;
@@ -496,7 +493,7 @@ struct mpi3_event_data_sas_topology_change_list {
 	u8                                 start_phy_num;
 	u8                                 exp_status;
 	u8                                 io_unit_port;
-	struct mpi3_event_sas_topo_phy_entry   phy_entry[MPI3_EVENT_SAS_TOPO_PHY_COUNT];
+	struct mpi3_event_sas_topo_phy_entry   phy_entry[] __counted_by(num_entries);
 };
 
 #define MPI3_EVENT_SAS_TOPO_ES_NO_EXPANDER              (0x00)
-- 
2.34.1