MdeModulePkg/Core: Fix potential array overflow

[mirror_edk2.git] / MdeModulePkg / Core / Dxe / Mem / HeapGuard.c

diff --git a/MdeModulePkg/Core/Dxe/Mem/HeapGuard.c b/MdeModulePkg/Core/Dxe/Mem/HeapGuard.c
index 30a73fc04d15ffbfc64a4395a622845c524d4fb6..3a829854af5eb7f7ebaa57aa81aca23536a657df 100644 (file)
--- a/MdeModulePkg/Core/Dxe/Mem/HeapGuard.c
+++ b/MdeModulePkg/Core/Dxe/Mem/HeapGuard.c
@@ -1110,7 +1110,9 @@ DumpGuardedMemoryBitmap (
   CHAR8     *Ruler1;\r
   CHAR8     *Ruler2;\r
 \r
-  if (mGuardedMemoryMap == 0) {\r
+  if (mGuardedMemoryMap == 0 ||\r
+      mMapLevel == 0 ||\r
+      mMapLevel > GUARDED_HEAP_MAP_TABLE_DEPTH) {\r
     return;\r
   }\r
 \r