[PATCH V2 1/3] MdeModulePkg/PartitionDxe: Correct the MBR last block value

["Gao, Zhichao" <zhichao.gao@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2823

The MBR last block value should be sector (512 bytes) numbers.

Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>
---
 MdeModulePkg/Universal/Disk/PartitionDxe/Mbr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Universal/Disk/PartitionDxe/Mbr.c b/MdeModulePkg/Universal/Disk/PartitionDxe/Mbr.c
index dac451a144..aa0b6cadcc 100644
--- a/MdeModulePkg/Universal/Disk/PartitionDxe/Mbr.c
+++ b/MdeModulePkg/Universal/Disk/PartitionDxe/Mbr.c
@@ -137,12 +137,14 @@ PartitionInstallMbrChildHandles (
   UINT32                       MediaId;
   EFI_LBA                      LastBlock;
   EFI_PARTITION_INFO_PROTOCOL  PartitionInfo;
+  UINT64                       MediaSize;
 
   Found           = EFI_NOT_FOUND;
 
   BlockSize = BlockIo->Media->BlockSize;
   MediaId   = BlockIo->Media->MediaId;
-  LastBlock = BlockIo->Media->LastBlock;
+  MediaSize = MultU64x32 (BlockIo->Media->LastBlock + 1, BlockSize);
+  LastBlock = DivU64x32 (MediaSize, 512) - 1;
 
   //
   // Ensure the block size can hold the MBR
-- 
2.21.0.windows.1