[reactos] 01/01: [PORTCLS] Zero memory in operator new. CORE-16157

[Thomas Faber]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=76e00fab7e959d4b4acd17...

commit 76e00fab7e959d4b4acd17dababc02f26c2208ef
Author:     Thomas Faber [e-mail]
AuthorDate: Fri Jul 5 17:26:16 2019 +0200
Commit:     Thomas Faber [e-mail]
CommitDate: Fri Jul 5 17:31:46 2019 +0200

[PORTCLS] Zero memory in operator new. CORE-16157

Fixes a regression from 99fa38809fd8ed38d4d59fa1fcf3babb3216b895, which
    replaced the kcom.h/stdunk.h versions (which zero memory) with local
    implementations (which don't).

Standard C++ does not guarantee that memory is zeroed but several classes
    rely on this, in particular for their m_Ref and m_bInitialized members.

Ideally the constructors should be fixed to initialize all required members,
    but that task is error-prone so for now we simply restore the previous
    behavior.
---
 drivers/wdm/audio/backpln/portcls/dma_slave.cpp      | 5 ++++-
 drivers/wdm/audio/backpln/portcls/miniport.cpp       | 5 ++++-
 drivers/wdm/audio/backpln/portcls/pin_wavecyclic.cpp | 5 ++++-
 3 files changed, 12 insertions(+), 3 deletions(-)

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);