diff --git a/drivers/wdm/audio/backpln/portcls/dma_slave.cpp b/drivers/wdm/audio/backpln/portcls/dma_slave.cpp
index a68d2779128..4a0553b3ba8 100644
--- a/drivers/wdm/audio/backpln/portcls/dma_slave.cpp
+++ b/drivers/wdm/audio/backpln/portcls/dma_slave.cpp
@@ -24,7 +24,10 @@ public:
         POOL_TYPE PoolType,
         ULONG Tag)
     {
-        return ExAllocatePoolWithTag(PoolType, Size, Tag);
+        PVOID P = ExAllocatePoolWithTag(PoolType, Size, Tag);
+        if (P)
+            RtlZeroMemory(P, Size);
+        return P;
     }
 
     STDMETHODIMP QueryInterface( REFIID InterfaceId, PVOID* Interface);
diff --git a/drivers/wdm/audio/backpln/portcls/miniport.cpp b/drivers/wdm/audio/backpln/portcls/miniport.cpp
index 526a012c7b1..8f00823770f 100644
--- a/drivers/wdm/audio/backpln/portcls/miniport.cpp
+++ b/drivers/wdm/audio/backpln/portcls/miniport.cpp
@@ -21,7 +21,10 @@ operator new(
     POOL_TYPE PoolType,
     ULONG Tag)
 {
-    return ExAllocatePoolWithTag(PoolType, Size, Tag);
+    PVOID P = ExAllocatePoolWithTag(PoolType, Size, Tag);
+    if (P)
+        RtlZeroMemory(P, Size);
+    return P;
 }
 
 void
diff --git a/drivers/wdm/audio/backpln/portcls/pin_wavecyclic.cpp b/drivers/wdm/audio/backpln/portcls/pin_wavecyclic.cpp
index 993ea92674b..e57fbefda74 100644
--- a/drivers/wdm/audio/backpln/portcls/pin_wavecyclic.cpp
+++ b/drivers/wdm/audio/backpln/portcls/pin_wavecyclic.cpp
@@ -25,7 +25,10 @@ public:
         POOL_TYPE PoolType,
         ULONG Tag)
     {
-        return ExAllocatePoolWithTag(PoolType, Size, Tag);
+        PVOID P = ExAllocatePoolWithTag(PoolType, Size, Tag);
+        if (P)
+            RtlZeroMemory(P, Size);
+        return P;
     }
 
     STDMETHODIMP QueryInterface( REFIID InterfaceId, PVOID* Interface);