2 files changed, 2 insertions, 2 deletions
diff --git a/src/VBox/Storage/VD.cpp b/src/VBox/Storage/VD.cpp
index 12535998b..5632e133b 100644
--- a/src/VBox/Storage/VD.cpp
+++ b/src/VBox/Storage/VD.cpp
@@ -1917,7 +1917,7 @@ static int vdParentRead(void *pvUser, uint64_t uOffset, void *pvBuf,
     Segment.cbSeg = cbRead;
     RTSgBufInit(&SgBuf, &Segment, 1);
     vdIoCtxInit(&IoCtx, pParentState->pDisk, VDIOCTXTXDIR_READ, uOffset, cbRead, pParentState->pImage,
-                &SgBuf, NULL, NULL, VDIOCTX_FLAGS_SYNC);
+                &SgBuf, NULL, NULL, VDIOCTX_FLAGS_SYNC | VDIOCTX_FLAGS_ZERO_FREE_BLOCKS);
     int rc = vdReadHelperAsync(&IoCtx);
     ASMAtomicXchgBool(&pParentState->pDisk->fLocked, false);
     return rc;
diff --git a/src/VBox/Storage/VHD.cpp b/src/VBox/Storage/VHD.cpp
index 3af2eba8e..c563a267c 100644
--- a/src/VBox/Storage/VHD.cpp
+++ b/src/VBox/Storage/VHD.cpp
@@ -2462,7 +2462,7 @@ static int vhdCompact(void *pBackendData, unsigned uPercentStart,
         if (pfnParentRead)
         {
             pvParent = RTMemTmpAlloc(pImage->cbDataBlock);
-            AssertBreakStmt(VALID_PTR(pvBuf), rc = VERR_NO_MEMORY);
+            AssertBreakStmt(VALID_PTR(pvParent), rc = VERR_NO_MEMORY);
         }
         pvBuf = RTMemTmpAlloc(pImage->cbDataBlock);
         AssertBreakStmt(VALID_PTR(pvBuf), rc = VERR_NO_MEMORY);