[PATCH] scsi: megaraid_sas: struct MR_HOST_DEVICE_LIST: Replace 1-element array with flexible array

From: Kees Cook
Date: Thu Jul 11 2024 - 11:59:27 EST


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

One binary difference appears in megasas_host_device_list_query():

struct MR_HOST_DEVICE_LIST *ci;
...
ci = instance->host_device_list_buf;
...
memset(ci, 0, sizeof(*ci));

The memset() clears only the non-flexible array fields. Looking at the
rest of the function, this appears to be fine: firmware is using this
region to communicate with the kernel, so it likely never made sense to
clear the first MR_HOST_DEVICE_LIST_ENTRY.

Link: https://github.com/KSPP/linux/issues/79 [1]
Signed-off-by: Kees Cook <kees@xxxxxxxxxx>
---
Cc: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>
Cc: Sumit Saxena <sumit.saxena@xxxxxxxxxxxx>
Cc: Shivasharan S <shivasharan.srikanteshwara@xxxxxxxxxxxx>
Cc: Chandrakanth patil <chandrakanth.patil@xxxxxxxxxxxx>
Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Cc: megaraidlinux.pdl@xxxxxxxxxxxx
Cc: linux-scsi@xxxxxxxxxxxxxxx
---
drivers/scsi/megaraid/megaraid_sas.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 84cf77c48c0d..088cc40ae866 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -814,12 +814,12 @@ struct MR_HOST_DEVICE_LIST {
__le32 size;
__le32 count;
__le32 reserved[2];
- struct MR_HOST_DEVICE_LIST_ENTRY host_device_list[1];
+ struct MR_HOST_DEVICE_LIST_ENTRY host_device_list[] __counted_by_le(count);
} __packed;

#define HOST_DEVICE_LIST_SZ (sizeof(struct MR_HOST_DEVICE_LIST) + \
(sizeof(struct MR_HOST_DEVICE_LIST_ENTRY) * \
- (MEGASAS_MAX_PD + MAX_LOGICAL_DRIVES_EXT - 1)))
+ (MEGASAS_MAX_PD + MAX_LOGICAL_DRIVES_EXT)))


/*
--
2.34.1