MdeModulePkg/PiSmmCore: fix mem alloc issues in heap guard

[mirror_edk2.git] / MdeModulePkg / Core / PiSmmCore / HeapGuard.c

diff --git a/MdeModulePkg/Core/PiSmmCore/HeapGuard.c b/MdeModulePkg/Core/PiSmmCore/HeapGuard.c
index aa9c25d1021d144d5ae3299c5a1aed44911e4f38..923af93de247d6788958e82701555ca63b9ba5e7 100644 (file)
--- a/MdeModulePkg/Core/PiSmmCore/HeapGuard.c
+++ b/MdeModulePkg/Core/PiSmmCore/HeapGuard.c
@@ -251,8 +251,8 @@ FindGuardedMemoryMap (
   //\r
   // Adjust current map table depth according to the address to access\r
   //\r
-  while (mMapLevel < GUARDED_HEAP_MAP_TABLE_DEPTH\r
-         &&\r
+  while (AllocMapUnit &&\r
+         mMapLevel < GUARDED_HEAP_MAP_TABLE_DEPTH &&\r
          RShiftU64 (\r
            Address,\r
            mLevelShift[GUARDED_HEAP_MAP_TABLE_DEPTH - mMapLevel - 1]\r
@@ -887,6 +887,10 @@ AdjustMemoryS (
   }\r
 \r
   Target = Start + Size - SizeRequested;\r
+  ASSERT (Target >= Start);\r
+  if (Target == 0) {\r
+    return 0;\r
+  }\r
 \r
   if (!IsGuardPage (Start + Size)) {\r
     // No Guard at tail to share. One more page is needed.\r