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Fix a bug in BlAddVirtualMemoryMapping() routine causing PF (Page Fault) on systems with more than 3GB of RAM

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This commit is contained in:
Rafal Kupiec 2022-12-11 13:56:40 +01:00
parent 8beb7c13ec
commit 2b679c11d4
Signed by: belliash
GPG Key ID: 4E829243E0CFE6B4
1 changed files with 12 additions and 13 deletions
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25
xtldr/memory.c
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@ -145,21 +145,20 @@ BlAddVirtualMemoryMapping(IN PLIST_ENTRY MemoryMappings,
if((Mapping2->PhysicalAddress >= Mapping1->PhysicalAddress && PhysicalAddress2End <= PhysicalAddressEnd) || if((Mapping2->PhysicalAddress >= Mapping1->PhysicalAddress && PhysicalAddress2End <= PhysicalAddressEnd) ||
(Mapping2->NumberOfPages == 0)) (Mapping2->NumberOfPages == 0))
{ {
/* Make sure it's memory type is LoaderFree */ /* If it is of LoaderFree type, then we can skip it */
if(Mapping2->MemoryType != LoaderFree) if(Mapping2->MemoryType == LoaderFree)
{ {
/* LoaderFree memory type is strictly expected */ /* Store address of the next mapping */
return STATUS_EFI_INVALID_PARAMETER; MappingListEntry = ListEntry->Flink;
/* Remove mapping from the list and free up it's memory */
RtlRemoveEntryList(&Mapping2->ListEntry);
BlEfiMemoryFreePool(Mapping2);
ListEntry = MappingListEntry;
/* Go to the next mapping */
continue;
} }
/* Store address of the next mapping */
MappingListEntry = ListEntry->Flink;
/* Remove mapping from the list and free up it's memory */
RtlRemoveEntryList(&Mapping2->ListEntry);
BlEfiMemoryFreePool(Mapping2);
ListEntry = MappingListEntry;
continue;
} }
/* Determine phsical address order */ /* Determine phsical address order */