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[NTOSKRNL]

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Fix potential overflows

CID #701302
CID #1206856

svn path=/trunk/; revision=63023
This commit is contained in:
Pierre Schweitzer 2014-04-27 18:46:26 +00:00
parent 4bf9c9fbab
commit 5cabd6269f
1 changed files with 2 additions and 2 deletions
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4
reactos/ntoskrnl/fstub/fstubex.c
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@ -1006,7 +1006,7 @@ FstubReadPartitionTableEFI(IN PDISK_INFORMATION Disk,
if ((Disk->SectorCount - 1ULL) != EfiHeader->AlternateLBA) if ((Disk->SectorCount - 1ULL) != EfiHeader->AlternateLBA)
{ {
/* We'll update it. First, count number of sectors needed to store partitions */ /* We'll update it. First, count number of sectors needed to store partitions */
SectorsForPartitions = (EfiHeader->NumberOfEntries * PARTITION_ENTRY_SIZE) / Disk->SectorSize; SectorsForPartitions = ((ULONGLONG)EfiHeader->NumberOfEntries * PARTITION_ENTRY_SIZE) / Disk->SectorSize;
/* Then set first usable LBA: Legacy MBR + GPT header + Partitions entries */ /* Then set first usable LBA: Legacy MBR + GPT header + Partitions entries */
EfiHeader->FirstUsableLBA = SectorsForPartitions + 2; EfiHeader->FirstUsableLBA = SectorsForPartitions + 2;
/* Then set last usable LBA: Last sector - GPT header - Partitions entries */ /* Then set last usable LBA: Last sector - GPT header - Partitions entries */
@ -1313,7 +1313,7 @@ FstubVerifyPartitionTableEFI(IN PDISK_INFORMATION Disk,
} }
/* Compute sectors taken by partitions */ /* Compute sectors taken by partitions */
SectorsForPartitions = ((EFIHeader->NumberOfEntries * PARTITION_ENTRY_SIZE) + Disk->SectorSize - 1) / Disk->SectorSize; SectorsForPartitions = (((ULONGLONG)EFIHeader->NumberOfEntries * PARTITION_ENTRY_SIZE) + Disk->SectorSize - 1) / Disk->SectorSize;
if (PrimaryValid) if (PrimaryValid)
{ {
WriteBackup = TRUE; WriteBackup = TRUE;