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[NTOS] Fix a NULL-pointer access bug.

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Hermès Bélusca-Maïto 2018-12-30 14:45:29 +01:00
parent fefb982d64
commit bf6b5e1ceb
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1 changed files with 2 additions and 1 deletions
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3
ntoskrnl/fstub/disksup.c
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@ -1392,7 +1392,6 @@ xHalIoReadPartitionTable(IN PDEVICE_OBJECT DeviceObject,
BOOLEAN IsValid, IsEmpty = TRUE;
PVOID MbrBuffer;
PIO_STACK_LOCATION IoStackLocation;
PBOOT_SECTOR_INFO BootSectorInfo = (PBOOT_SECTOR_INFO)Buffer;
UCHAR PartitionType;
LARGE_INTEGER HiddenSectors64;
VolumeOffset.QuadPart = Offset.QuadPart = 0;
@ -1723,6 +1722,8 @@ xHalIoReadPartitionTable(IN PDEVICE_OBJECT DeviceObject,
if ((DiskGeometry.MediaType == RemovableMedia) &&
(j == 0) && (MbrFound) && (IsEmpty))
{
PBOOT_SECTOR_INFO BootSectorInfo = (PBOOT_SECTOR_INFO)Buffer;
/* Read the jump bytes to detect super-floppy */
if ((BootSectorInfo->JumpByte[0] == 0xeb) ||
(BootSectorInfo->JumpByte[0] == 0xe9))