From 02d348bf34227a8c176546fd05bb9555ae04178e Mon Sep 17 00:00:00 2001
From: Pierre Schweitzer <pierre@reactos.org>
Date: Sun, 6 Apr 2014 17:18:55 +0000
Subject: [PATCH] [NTOSKRNL] Fix overflow

CID #701303

svn path=/trunk/; revision=62668
---
 reactos/ntoskrnl/fstub/fstubex.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/reactos/ntoskrnl/fstub/fstubex.c b/reactos/ntoskrnl/fstub/fstubex.c
index beb66fb254b..e864c1f09cd 100644
--- a/reactos/ntoskrnl/fstub/fstubex.c
+++ b/reactos/ntoskrnl/fstub/fstubex.c
@@ -2474,7 +2474,7 @@ IoWritePartitionTableEx(IN PDEVICE_OBJECT DeviceObject,
                     NumberOfEntries = EfiHeader->NumberOfEntries;
                     RtlCopyMemory(&DiskGuid, &EfiHeader->DiskGUID, sizeof(GUID));
                     /* Count number of sectors needed to store partitions */
-                    SectorsForPartitions = (NumberOfEntries * PARTITION_ENTRY_SIZE) / Disk->SectorSize;
+                    SectorsForPartitions = ((ULONGLONG)NumberOfEntries * PARTITION_ENTRY_SIZE) / Disk->SectorSize;
                     /* Set first usable LBA: Legacy MBR + GPT header + Partitions entries */
                     FirstUsableLBA = SectorsForPartitions + 2;
                     /* Set last usable LBA: Last sector - GPT header - Partitions entries */