Update check for enough space to occur prior to alignment offset
modification. This prevents a case where EfiFreeMemoryTop could be
less than EfiFreeMemoryBottom
Signed-off-by: Jeff Brasen <jbra...@nvidia.com>
---
.../MemoryAllocationLib.c | 53 +++++++++++--------
1 file changed, 30 insertions(+), 23 deletions(-)
diff --git a/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c
b/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c
index 2cc2a71121..9208826565 100644
--- a/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c
+++ b/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c
@@ -27,37 +27,44 @@ InternalAllocatePages (
Hob.Raw = GetHobList ();
- // Check to see if on 4k boundary
Offset = Hob.HandoffInformationTable->EfiFreeMemoryTop & 0xFFF;
+ //
+ // Verify that there is sufficient memory to satisfy the allocation and
padding prior to updating anything
+ //
+ if ((Hob.HandoffInformationTable->EfiFreeMemoryTop - ((Pages *
EFI_PAGE_SIZE) + sizeof (EFI_HOB_MEMORY_ALLOCATION)) - Offset) <
Hob.HandoffInformationTable->EfiFreeMemoryBottom) {
+ if (Offset != 0) {
+ DEBUG ((DEBUG_ERROR, "Offset applied without enough space\r\n"));
+ } else {
+ DEBUG ((DEBUG_ERROR, "Out of memory\r\n"));
+ }
+
+ ASSERT (FALSE);
+ return 0;
+ }
+
+ // Check to see if on 4k boundary
if (Offset != 0) {
// If not aligned, make the allocation aligned.
Hob.HandoffInformationTable->EfiFreeMemoryTop -= Offset;
}
//
- // Verify that there is sufficient memory to satisfy the allocation
+ // Update the PHIT to reflect the memory usage
//
- if (Hob.HandoffInformationTable->EfiFreeMemoryTop - ((Pages * EFI_PAGE_SIZE)
+ sizeof (EFI_HOB_MEMORY_ALLOCATION)) <
Hob.HandoffInformationTable->EfiFreeMemoryBottom) {
- return 0;
- } else {
- //
- // Update the PHIT to reflect the memory usage
- //
- Hob.HandoffInformationTable->EfiFreeMemoryTop -= Pages * EFI_PAGE_SIZE;
-
- // This routine used to create a memory allocation HOB a la PEI, but
that's not
- // necessary for us.
-
- //
- // Create a memory allocation HOB.
- //
- BuildMemoryAllocationHob (
- Hob.HandoffInformationTable->EfiFreeMemoryTop,
- Pages * EFI_PAGE_SIZE,
- MemoryType
- );
- return (VOID *)(UINTN)Hob.HandoffInformationTable->EfiFreeMemoryTop;
- }
+ Hob.HandoffInformationTable->EfiFreeMemoryTop -= Pages * EFI_PAGE_SIZE;
+
+ // This routine used to create a memory allocation HOB a la PEI, but that's
not
+ // necessary for us.
+
+ //
+ // Create a memory allocation HOB.
+ //
+ BuildMemoryAllocationHob (
+ Hob.HandoffInformationTable->EfiFreeMemoryTop,
+ Pages * EFI_PAGE_SIZE,
+ MemoryType
+ );
+ return (VOID *)(UINTN)Hob.HandoffInformationTable->EfiFreeMemoryTop;
}
/**
--
2.25.1
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#93448): https://edk2.groups.io/g/devel/message/93448
Mute This Topic: https://groups.io/mt/93527827/21656
Group Owner: devel+ow...@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com]
-=-=-=-=-=-=-=-=-=-=-=-
