[PATCH v2 3/4][next] scsi: megaraid_sas: Replace one-element array with flexible-array member in MR_DRV_RAID_MAP

Gustavo A. R. Silva
2021-08-05T04:17:30Z

Replace one-element array with a flexible-array member in struct
MR_DRV_RAID_MAP and use the flex_array_size() helper.

This helps with the ongoing efforts to globally enable -Warray-bounds
and get us closer to being able to tighten the FORTIFY_SOURCE routines
on memcpy().

Link: https://en.wikipedia.org/wiki/Flexible_array_member
Link: https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/109
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
Changes in v2:
- None.

drivers/scsi/megaraid/megaraid_sas_fp.c | 6 +++---
drivers/scsi/megaraid/megaraid_sas_fusion.h | 2 +-
2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_fp.c b/drivers/scsi/megaraid/megaraid_sas_fp.c
index da1cad1ee123..9cb36ef96c2c 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fp.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fp.c
@@ -229,8 +229,8 @@ static int MR_PopulateDrvRaidMap(struct megasas_instance *instance, u64 map_id)
le32_to_cpu(desc_table->raid_map_desc_offset));
memcpy(pDrvRaidMap->ldSpanMap,
fw_map_dyn->ld_span_map,
- sizeof(struct MR_LD_SPAN_MAP) *
- le32_to_cpu(desc_table->raid_map_desc_elements));
+ flex_array_size(pDrvRaidMap, ldSpanMap,
+ le32_to_cpu(desc_table->raid_map_desc_elements)));
break;
default:
dev_dbg(&instance->pdev->dev, "wrong number of desctableElements %d\n",
@@ -254,7 +254,7 @@ static int MR_PopulateDrvRaidMap(struct megasas_instance *instance, u64 map_id)
pDrvRaidMap->ldTgtIdToLd[i] =
(u16)fw_map_ext->ldTgtIdToLd[i];
memcpy(pDrvRaidMap->ldSpanMap, fw_map_ext->ldSpanMap,
- sizeof(struct MR_LD_SPAN_MAP) * ld_count);
+ flex_array_size(pDrvRaidMap, ldSpanMap, ld_count));
memcpy(pDrvRaidMap->arMapInfo, fw_map_ext->arMapInfo,
sizeof(struct MR_ARRAY_INFO) * MAX_API_ARRAYS_EXT);
memcpy(pDrvRaidMap->devHndlInfo, fw_map_ext->devHndlInfo,
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h
index 9adb8b30f422..5fe2f7a6eebe 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.h
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h
@@ -1182,7 +1182,7 @@ struct MR_DRV_RAID_MAP {
devHndlInfo[MAX_RAIDMAP_PHYSICAL_DEVICES_DYN];
u16 ldTgtIdToLd[MAX_LOGICAL_DRIVES_DYN];
struct MR_ARRAY_INFO arMapInfo[MAX_API_ARRAYS_DYN];
- struct MR_LD_SPAN_MAP ldSpanMap[1];
+ struct MR_LD_SPAN_MAP ldSpanMap[];

};

--
2.27.0