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Check the length of the gap if this starts at the begin or end of the area in MmFindGap.

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svn path=/trunk/; revision=4099
This commit is contained in:
Hartmut Birr 2003-02-02 08:55:51 +00:00
parent f0fd058aef
commit f979d1b237
1 changed files with 23 additions and 4 deletions
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27
reactos/ntoskrnl/mm/marea.c
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@ -212,6 +212,7 @@ PVOID MmFindGap(PMADDRESS_SPACE AddressSpace, ULONG Length)
MEMORY_AREA* current;
MEMORY_AREA* next;
ULONG Gap;
PVOID Address;
DPRINT("MmFindGap(Length %x)\n",Length);
@ -232,11 +233,29 @@ PVOID MmFindGap(PMADDRESS_SPACE AddressSpace, ULONG Length)
if (current_entry == ListHead)
{
return((PVOID)AddressSpace->LowestAddress);
Address = (PVOID)AddressSpace->LowestAddress;
}
current = CONTAINING_RECORD(current_entry,MEMORY_AREA,Entry);
return(current->BaseAddress + PAGE_ROUND_UP(current->Length));
else
{
current = CONTAINING_RECORD(current_entry,MEMORY_AREA,Entry);
Address = current->BaseAddress + PAGE_ROUND_UP(current->Length);
}
/* Check if enough space for the block */
if (AddressSpace->LowestAddress < KERNEL_BASE)
{
if ((ULONG)Address >= KERNEL_BASE || Length > KERNEL_BASE - (ULONG)Address)
{
return NULL;
}
}
else
{
if (Length >= 0xFFFFFFFF - (ULONG)Address)
{
return NULL;
}
}
return Address;
}
NTSTATUS MmInitMemoryAreas(VOID)