[janderwald] 42438: - Check if translated / untranslated resource list is empty - If both are empty, create an empty resource list - May fix a crash with Yamaha XG Pci

Author: janderwald
Date: Thu Aug  6 22:44:53 2009
New Revision: 42438

URL: http://svn.reactos.org/svn/reactos?rev=42438&view=rev
Log:
- Check if translated / untranslated resource list is empty
- If both are empty, create an empty resource list
- May fix a crash with Yamaha XG Pci 

Modified:
    trunk/reactos/drivers/wdm/audio/backpln/portcls/resource.c

Modified: trunk/reactos/drivers/wdm/audio/backpln/portcls/resource.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/wdm/audio/backpln/…
==============================================================================
--- trunk/reactos/drivers/wdm/audio/backpln/portcls/resource.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/wdm/audio/backpln/portcls/resource.c [iso-8859-1] Thu Aug  6
22:44:53 2009
@@ -351,13 +351,31 @@
     IN  PCM_RESOURCE_LIST UntranslatedResourceList)
 {
     PCM_RESOURCE_LIST NewUntranslatedResources, NewTranslatedResources;
-    ULONG NewTranslatedSize, NewUntranslatedSize;
+    ULONG NewTranslatedSize, NewUntranslatedSize, ResourceCount;
     IResourceListImpl* NewList;
 
-    /* TODO: Validate parameters */
-
+    if (!TranslatedResourceList)
+    {
+        /* if the untranslated resource list is also not provided, it becomes an empty
resource list */
+        if (UntranslatedResourceList)
+        {
+            /* invalid parameter mix */
+            return STATUS_INVALID_PARAMETER;
+        }
+    }
+    else
+    {
+        /* if the translated resource list is also not provided, it becomes an empty
resource list */
+        if (!UntranslatedResourceList)
+        {
+            /* invalid parameter mix */
+            return STATUS_INVALID_PARAMETER;
+        }
+    }
+
+    /* allocate resource list ctx */
     NewList = AllocateItem(PoolType, sizeof(IResourceListImpl), TAG_PORTCLASS);
-
+    /* check for success */
     if (!NewList)
     {
         DPRINT("AllocateItem failed\n");
@@ -365,39 +383,50 @@
     }
 
     /* Initialize */
-
-    NewTranslatedSize = sizeof(CM_RESOURCE_LIST);
-    if (TranslatedResourceList[0].List->PartialResourceList.Count > 1)
-        NewTranslatedSize +=
(TranslatedResourceList[0].List->PartialResourceList.Count-1) *
sizeof(CM_PARTIAL_RESOURCE_DESCRIPTOR);
-
-    NewTranslatedResources = AllocateItem(PoolType, NewTranslatedSize, TAG_PORTCLASS);
-    if (!NewTranslatedResources)
-    {
-        FreeItem(NewList, TAG_PORTCLASS);
-        return STATUS_INSUFFICIENT_RESOURCES;
-    }
-
-    NewUntranslatedSize = sizeof(CM_RESOURCE_LIST);
-    if (UntranslatedResourceList[0].List->PartialResourceList.Count > 1)
-        NewUntranslatedSize +=
(UntranslatedResourceList[0].List->PartialResourceList.Count-1) *
sizeof(CM_PARTIAL_RESOURCE_DESCRIPTOR);
-
-    NewUntranslatedResources = AllocateItem(PoolType, NewUntranslatedSize,
TAG_PORTCLASS);
-    if (!NewUntranslatedResources)
-    {
-        FreeItem(NewList, TAG_PORTCLASS);
-        FreeItem(NewTranslatedResources, TAG_PORTCLASS);
-        return STATUS_INSUFFICIENT_RESOURCES;
-    }
-
-    RtlCopyMemory(NewTranslatedResources, TranslatedResourceList, NewTranslatedSize);
-    RtlCopyMemory(NewUntranslatedResources, UntranslatedResourceList,
NewUntranslatedSize);
-
     NewList->lpVtbl = (IResourceListVtbl*)&vt_ResourceListVtbl;
     NewList->ref = 1;
     NewList->OuterUnknown = OuterUnknown;
+    NewList->PoolType = PoolType;
+
+    if (!TranslatedResourceList || !UntranslatedResourceList)
+    {
+        /* empty resource list */
+        *OutResourceList = (IResourceList*)&NewList->lpVtbl;
+        return STATUS_SUCCESS;
+    }
+
+    /* calculate translated resource list size */
+    ResourceCount = TranslatedResourceList->List[0].PartialResourceList.Count;
+    NewTranslatedSize = FIELD_OFFSET(CM_RESOURCE_LIST,
List[0].PartialResourceList.PartialDescriptors[ResourceCount]);
+
+    /* calculate untranslated resouce list size */
+    ResourceCount = UntranslatedResourceList->List[0].PartialResourceList.Count;
+    NewUntranslatedSize = FIELD_OFFSET(CM_RESOURCE_LIST,
List[0].PartialResourceList.PartialDescriptors[ResourceCount]);
+
+    /* allocate translated resource list */
+    NewTranslatedResources = AllocateItem(PoolType, NewTranslatedSize, TAG_PORTCLASS);
+    if (!NewTranslatedResources)
+    {
+        FreeItem(NewList, TAG_PORTCLASS);
+        return STATUS_INSUFFICIENT_RESOURCES;
+    }
+
+    /* allocate untranslated resource list */
+    NewUntranslatedResources = AllocateItem(PoolType, NewUntranslatedSize,
TAG_PORTCLASS);
+    if (!NewUntranslatedResources)
+    {
+        FreeItem(NewList, TAG_PORTCLASS);
+        FreeItem(NewTranslatedResources, TAG_PORTCLASS);
+        return STATUS_INSUFFICIENT_RESOURCES;
+    }
+
+    /* copy resource lists */
+    RtlCopyMemory(NewTranslatedResources, TranslatedResourceList, NewTranslatedSize);
+    RtlCopyMemory(NewUntranslatedResources, UntranslatedResourceList,
NewUntranslatedSize);
+
+    /* store resource lists */
     NewList->TranslatedResourceList= NewTranslatedResources;
     NewList->UntranslatedResourceList = NewUntranslatedResources;
-    NewList->PoolType = PoolType;
 
     /* Increment our usage count and set the pointer to this object */
     *OutResourceList = (IResourceList*)&NewList->lpVtbl;
@@ -405,7 +434,9 @@
     return STATUS_SUCCESS;
 }
 
-PORTCLASSAPI NTSTATUS NTAPI
+PORTCLASSAPI
+NTSTATUS
+NTAPI
 PcNewResourceSublist(
     OUT PRESOURCELIST* OutResourceList,
     IN  PUNKNOWN OuterUnknown OPTIONAL,