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[NTVDM]

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Fill the part of the buffer that was supposed to receive memory data
above the MAX_ADDRESS with 0xFF.


svn path=/trunk/; revision=67707
This commit is contained in:
Aleksandar Andrejevic 2015-05-13 23:23:17 +00:00
parent 41b8d0a78c
commit 365727d3e7
1 changed files with 10 additions and 2 deletions
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12
reactos/subsystems/mvdm/ntvdm/emulator.c
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@ -73,8 +73,16 @@ VOID WINAPI EmulatorReadMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer
/* If the A20 line is disabled, mask bit 20 */
if (!A20Line) Address &= ~(1 << 20);
if (Address >= MAX_ADDRESS) return;
Size = min(Size, MAX_ADDRESS - Address);
if ((Address + Size - 1) >= MAX_ADDRESS)
{
ULONG ExtraStart = (Address < MAX_ADDRESS) ? MAX_ADDRESS - Address : 0;
/* Fill the memory that was above the limit with 0xFF */
RtlFillMemory((PVOID)((ULONG_PTR)Buffer + ExtraStart), Size - ExtraStart, 0xFF);
if (Address < MAX_ADDRESS) Size = MAX_ADDRESS - Address;
else return;
}
/* Read while calling fast memory hooks */
MemRead(Address, Buffer, Size);