diff --git a/dlls/setupapi/parser.c b/dlls/setupapi/parser.c
index f82924550a4..9369f21011e 100644
--- a/dlls/setupapi/parser.c
+++ b/dlls/setupapi/parser.c
@@ -159,10 +159,17 @@ static void *grow_array( void *array, unsigned int *count, size_t elem )
     void *new_array;
     unsigned int new_count = *count + *count / 2;
     if (new_count < 32) new_count = 32;
-    if ((new_array = HeapReAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, array, new_count * elem )))
+
+    if (array)
+	new_array = HeapReAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, array, new_count * elem );
+    else
+	new_array = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, new_count * elem );
+
+    if (new_array)
         *count = new_count;
     else
-        HeapFree( GetProcessHeap(), 0, array );
+	if (array)
+    	    HeapFree( GetProcessHeap(), 0, array );
     return new_array;
 }
 
diff --git a/dlls/setupapi/virtcopy.c b/dlls/setupapi/virtcopy.c
index 2f6562285f0..47c79dcf54a 100644
--- a/dlls/setupapi/virtcopy.c
+++ b/dlls/setupapi/virtcopy.c
@@ -124,7 +124,12 @@ VHSTR WINAPI vsmStringAdd16(LPCSTR lpszName)
     {
 	index = vhstr_alloc;
 	vhstr_alloc += 20;
-	vhstrlist = HeapReAlloc(heap, HEAP_ZERO_MEMORY, vhstrlist,
+
+	if (vhstrlist)
+	    vhstrlist = HeapReAlloc(heap, HEAP_ZERO_MEMORY, vhstrlist,
+					sizeof(VHSTR_STRUCT *) * vhstr_alloc);
+	else
+	    vhstrlist = HeapAlloc(heap, HEAP_ZERO_MEMORY,
 					sizeof(VHSTR_STRUCT *) * vhstr_alloc);
     }
     if (index == 0xffff)
@@ -229,7 +234,11 @@ RETERR16 VCP_VirtnodeCreate(LPVCPFILESPEC vfsSrc, LPVCPFILESPEC vfsDst, WORD fl,
     if (vn_last == vn_num)
     {
 	vn_num += 20;
-        pvnlist = HeapReAlloc(heap, HEAP_ZERO_MEMORY, pvnlist,
+	if (pvnlist)
+	    pvnlist = HeapReAlloc(heap, HEAP_ZERO_MEMORY, pvnlist,
+		    		sizeof(LPVIRTNODE *) * vn_num);
+	else
+	    pvnlist = HeapAlloc(heap, HEAP_ZERO_MEMORY, 
 		    		sizeof(LPVIRTNODE *) * vn_num);
     }
     pvnlist[vn_last] = HeapAlloc(heap, HEAP_ZERO_MEMORY, sizeof(VIRTNODE));
diff --git a/dlls/x11drv/xrender.c b/dlls/x11drv/xrender.c
index 2082f8ec84a..efc90ac15ed 100644
--- a/dlls/x11drv/xrender.c
+++ b/dlls/x11drv/xrender.c
@@ -334,10 +334,17 @@ static int AllocEntry(void)
   }
 
   TRACE("Growing cache\n");
-  glyphsetCache = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
+  
+  if (glyphsetCache)
+    glyphsetCache = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 			      glyphsetCache,
 			      (glyphsetCacheSize + INIT_CACHE_SIZE)
 			      * sizeof(*glyphsetCache));
+  else
+    glyphsetCache = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
+			      (glyphsetCacheSize + INIT_CACHE_SIZE)
+			      * sizeof(*glyphsetCache));
+
   for(best = i = glyphsetCacheSize; i < glyphsetCacheSize + INIT_CACHE_SIZE;
       i++) {
     glyphsetCache[i].next = i + 1;
@@ -538,19 +545,37 @@ static BOOL UploadGlyph(X11DRV_PDEVICE *physDev, int glyph)
 
     if(entry->nrealized <= glyph) {
         entry->nrealized = (glyph / 128 + 1) * 128;
-	entry->realized = HeapReAlloc(GetProcessHeap(),
+
+	if (entry->realized)
+	    entry->realized = HeapReAlloc(GetProcessHeap(),
 				      HEAP_ZERO_MEMORY,
 				      entry->realized,
 				      entry->nrealized * sizeof(BOOL));
+	else
+	    entry->realized = HeapAlloc(GetProcessHeap(),
+				      HEAP_ZERO_MEMORY,
+				      entry->nrealized * sizeof(BOOL));
+
 	if(entry->glyphset == 0) {
-	  entry->bitmaps = HeapReAlloc(GetProcessHeap(),
+	  if (entry->bitmaps)
+	    entry->bitmaps = HeapReAlloc(GetProcessHeap(),
 				      HEAP_ZERO_MEMORY,
 				      entry->bitmaps,
 				      entry->nrealized * sizeof(entry->bitmaps[0]));
-	  entry->gis = HeapReAlloc(GetProcessHeap(),
+	  else
+	    entry->bitmaps = HeapAlloc(GetProcessHeap(),
+				      HEAP_ZERO_MEMORY,
+				      entry->nrealized * sizeof(entry->bitmaps[0]));
+
+	  if (entry->gis)
+	    entry->gis = HeapReAlloc(GetProcessHeap(),
 				   HEAP_ZERO_MEMORY,
 				   entry->gis,
 				   entry->nrealized * sizeof(entry->gis[0]));
+	  else
+	    entry->gis = HeapAlloc(GetProcessHeap(),
+				   HEAP_ZERO_MEMORY,
+				   entry->nrealized * sizeof(entry->gis[0]));
 	}
     }