Patch "scsi: megaraid_sas: Error handling for invalid ldcount provided by firmware in RAID map" has been added to the 4.15-stable tree

@@ -168,7 +168,7 @@ static struct MR_LD_SPAN *MR_LdSpanPtrGe
 /*
  * This function will Populate Driver Map using firmware raid map
  */
-void MR_PopulateDrvRaidMap(struct megasas_instance *instance)
+static int MR_PopulateDrvRaidMap(struct megasas_instance *instance)
 {
 	struct fusion_context *fusion = instance->ctrl_context;
 	struct MR_FW_RAID_MAP_ALL     *fw_map_old    = NULL;

@@ -259,7 +259,7 @@ void MR_PopulateDrvRaidMap(struct megasa
 		ld_count = (u16)le16_to_cpu(fw_map_ext->ldCount);
 		if (ld_count > MAX_LOGICAL_DRIVES_EXT) {
 			dev_dbg(&instance->pdev->dev, "megaraid_sas: LD count exposed in RAID map in not valid\n");
-			return;
+			return 1;
 		}
 
 		pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);

@@ -285,6 +285,12 @@ void MR_PopulateDrvRaidMap(struct megasa
 			fusion->ld_map[(instance->map_id & 1)];
 		pFwRaidMap = &fw_map_old->raidMap;
 		ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);
+		if (ld_count > MAX_LOGICAL_DRIVES) {
+			dev_dbg(&instance->pdev->dev,
+				"LD count exposed in RAID map in not valid\n");
+			return 1;
+		}
+
 		pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
 		pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 		pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;

@@ -300,6 +306,8 @@ void MR_PopulateDrvRaidMap(struct megasa
 			sizeof(struct MR_DEV_HANDLE_INFO) *
 			MAX_RAIDMAP_PHYSICAL_DEVICES);
 	}
+
+	return 0;
 }
 
 /*

@@ -317,8 +325,8 @@ u8 MR_ValidateMapInfo(struct megasas_ins
 	u16 ld;
 	u32 expected_size;
 
-
-	MR_PopulateDrvRaidMap(instance);
+	if (MR_PopulateDrvRaidMap(instance))
+		return 0;
 
 	fusion = instance->ctrl_context;
 	drv_map = fusion->ld_drv_map[(instance->map_id & 1)];