https://git.reactos.org/?p=reactos.git;a=commitdiff;h=bf6b5e1ceb7fdfd4850cf330115d74810c376b13
commit bf6b5e1ceb7fdfd4850cf330115d74810c376b13 Author: Hermès Bélusca-Maïto <[email protected]> AuthorDate: Sun Dec 30 14:45:29 2018 +0100 Commit: Hermès Bélusca-Maïto <[email protected]> CommitDate: Sun Dec 30 15:26:43 2018 +0100 [NTOS] Fix a NULL-pointer access bug. --- ntoskrnl/fstub/disksup.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/ntoskrnl/fstub/disksup.c b/ntoskrnl/fstub/disksup.c index e7ab0a7990..dfdbf0c494 100644 --- a/ntoskrnl/fstub/disksup.c +++ b/ntoskrnl/fstub/disksup.c @@ -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))
