scsi: megaraid_sas: MR_TargetIdToLdGet u8 to u16 and avoid invalid raid-map access

Change MR_TargetIdToLdGet return type from u8 to u16.

ld id range check is added at two places in this patch -
@megasas_build_ldio_fusion and @megasas_build_ld_nonrw_fusion.  Previous
driver code used different data type for lds TargetId returned from
MR_TargetIdToLdGet.  Prior to this change, above two functions was
safeguarded due to function always return u8 and maximum value of ld id
returned was 255.

In below check, fw_supported_vd_count as of today is 64 or 256 and valid
range to support is either 0-63 or 0-255. Ideally want to filter
accessing raid map for ld ids which are not valid. With the u16 change,
invalid ld id value is 0xFFFF and we will see kernel panic due to random
memory access in MR_LdRaidGet.  The changes will ensure we do not call
MR_LdRaidGet if ld id is beyond size of ldSpanMap array.

               if (ld < instance->fw_supported_vd_count)

>From firmware perspective,ld id 0xFF is invalid and even though current
driver code forward such command, firmware fails with target not
available.

ld target id issue occurs mainly whenever driver loops to populate raid
map (ea. MR_ValidateMapInfo).  These are the only two places where we
may see out of range target ids and wants to protect raid map access
based on range provided by Firmware API.

Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 14 insertions, 11 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 9019b82b467f..4aaf30769c94 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -1121,7 +1121,8 @@ megasas_sync_map_info(struct megasas_instance *instance)
 	int i;
 	struct megasas_cmd *cmd;
 	struct megasas_dcmd_frame *dcmd;
-	u32 size_sync_info, num_lds;
+	u16 num_lds;
+	u32 size_sync_info;
 	struct fusion_context *fusion;
 	struct MR_LD_TARGET_SYNC *ci = NULL;
 	struct MR_DRV_RAID_MAP_ALL *map;
@@ -1870,7 +1871,7 @@ megasas_set_pd_lba(struct MPI2_RAID_SCSI_IO_REQUEST *io_request, u8 cdb_len,
 		   struct MR_DRV_RAID_MAP_ALL *local_map_ptr, u32 ref_tag)
 {
 	struct MR_LD_RAID *raid;
-	u32 ld;
+	u16 ld;
 	u64 start_blk = io_info->pdBlock;
 	u8 *cdb = io_request->CDB.CDB32;
 	u32 num_blocks = io_info->numBlocks;
@@ -2303,10 +2304,11 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
 
 	local_map_ptr = fusion->ld_drv_map[(instance->map_id & 1)];
 	ld = MR_TargetIdToLdGet(device_id, local_map_ptr);
-	raid = MR_LdRaidGet(ld, local_map_ptr);
 
-	if ((MR_TargetIdToLdGet(device_id, local_map_ptr) >=
-		instance->fw_supported_vd_count) || (!fusion->fast_path_io)) {
+	if (ld < instance->fw_supported_vd_count)
+		raid = MR_LdRaidGet(ld, local_map_ptr);
+
+	if (!raid || (!fusion->fast_path_io)) {
 		io_request->RaidContext.raid_context.reg_lock_flags  = 0;
 		fp_possible = false;
 	} else {
@@ -2478,12 +2480,12 @@ static void megasas_build_ld_nonrw_fusion(struct megasas_instance *instance,
 {
 	u32 device_id;
 	struct MPI2_RAID_SCSI_IO_REQUEST *io_request;
-	u16 pd_index = 0;
+	u16 pd_index = 0, ld;
 	struct MR_DRV_RAID_MAP_ALL *local_map_ptr;
 	struct fusion_context *fusion = instance->ctrl_context;
 	u8                          span, physArm;
 	__le16                      devHandle;
-	u32                         ld, arRef, pd;
+	u32                         arRef, pd;
 	struct MR_LD_RAID                  *raid;
 	struct RAID_CONTEXT                *pRAID_Context;
 	u8 fp_possible = 1;
@@ -2506,10 +2508,11 @@ static void megasas_build_ld_nonrw_fusion(struct megasas_instance *instance,
 		ld = MR_TargetIdToLdGet(device_id, local_map_ptr);
 		if (ld >= instance->fw_supported_vd_count)
 			fp_possible = 0;
-
-		raid = MR_LdRaidGet(ld, local_map_ptr);
-		if (!(raid->capability.fpNonRWCapable))
-			fp_possible = 0;
+		else {
+			raid = MR_LdRaidGet(ld, local_map_ptr);
+			if (!(raid->capability.fpNonRWCapable))
+				fp_possible = 0;
+		}
 	} else
 		fp_possible = 0;