Current code relies on last entry in hob to be MaxMemoryType enum value
which keeps changing on new memory type definition. If the HOB is
created by binaries built with older Edk2, current code leads to hang
which could be avoided by using hob size.
Signed-off-by: Baraneedharan Anbazhagan anbazhagan@hp.com<mailto:anbazhagan@hp.com>
---
MdeModulePkg/Library/UefiBootManagerLib/BmMisc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/MdeModulePkg/Library/UefiBootManagerLib/BmMisc.c b/MdeModulePkg/Library/UefiBootManagerLib/BmMisc.c
index a5e32ebdba..014e4557bf 100644
--- a/MdeModulePkg/Library/UefiBootManagerLib/BmMisc.c
+++ b/MdeModulePkg/Library/UefiBootManagerLib/BmMisc.c
@@ -140,6 +140,7 @@ BmSetMemoryTypeInformationVariable (
UINT32 Current;
UINT32 Next;
EFI_HOB_GUID_TYPE *GuidHob;
+ UINTN NoOfEntries;
BOOLEAN MemoryTypeInformationModified;
BOOLEAN MemoryTypeInformationVariableExists;
EFI_BOOT_MODE BootMode;
@@ -200,6 +201,7 @@ BmSetMemoryTypeInformationVariable (
}
VariableSize = GET_GUID_HOB_DATA_SIZE (GuidHob);
+ NoOfEntries = VariableSize / sizeof(EFI_MEMORY_TYPE_INFORMATION);
PreviousMemoryTypeInformation = AllocateCopyPool (VariableSize, GET_GUID_HOB_DATA (GuidHob));
if (PreviousMemoryTypeInformation == NULL) {
return;
@@ -212,8 +214,8 @@ BmSetMemoryTypeInformationVariable (
DEBUG ((DEBUG_INFO, " Type Pages Pages Pages \n"));
DEBUG ((DEBUG_INFO, "====== ======== ======== ========\n"));
- for (Index = 0; PreviousMemoryTypeInformation[Index].Type != EfiMaxMemoryType; Index++) {
- for (Index1 = 0; CurrentMemoryTypeInformation[Index1].Type != EfiMaxMemoryType; Index1++) {
+ for (Index = 0; Index < NoOfEntries; Index++) {
+ for (Index1 = 0; Index1 < NoOfEntries; Index1++) {
if (PreviousMemoryTypeInformation[Index].Type == CurrentMemoryTypeInformation[Index1].Type) {
break;
}
--
2.38.1.windows.1
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