[cgutman] 46119: - Fix the resource parsing loops to correct a memory corruption issue - Return the correct failure status if ExAllocatePool fails

Author: cgutman
Date: Thu Mar 11 23:15:21 2010
New Revision: 46119

URL: http://svn.reactos.org/svn/reactos?rev=46119&view=rev
Log:
 - Fix the resource parsing loops to correct a memory corruption issue
 - Return the correct failure status if ExAllocatePool fails

Modified:
    trunk/reactos/drivers/bus/acpi/buspdo.c

Modified: trunk/reactos/drivers/bus/acpi/buspdo.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/bus/acpi/buspdo.c?…
==============================================================================
--- trunk/reactos/drivers/bus/acpi/buspdo.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/bus/acpi/buspdo.c [iso-8859-1] Thu Mar 11 23:15:21 2010
@@ -585,7 +585,6 @@
      PPDO_DEVICE_DATA     DeviceData,
       PIRP   Irp )
 {
-	BOOLEAN Done;
 	ULONG NumberOfResources = 0;
 	PCM_RESOURCE_LIST ResourceList;
 	PCM_PARTIAL_RESOURCE_DESCRIPTOR ResourceDescriptor;
@@ -595,7 +594,6 @@
 	ULONG ResourceListSize;
 	ULONG i;
 
-
     /* Get current resources */
     Buffer.Length = 0;
     AcpiStatus = AcpiGetCurrentResources(DeviceData->AcpiHandle, &Buffer);
@@ -619,8 +617,7 @@
 
 	resource= Buffer.Pointer;
 	/* Count number of resources */
-	Done = FALSE;
-	while (!Done)
+	while (resource->Type != ACPI_RESOURCE_TYPE_END_TAG)
 	{
 		switch (resource->Type)
 		{
@@ -641,13 +638,9 @@
 				NumberOfResources++;
 				break;
 			}
-			case ACPI_RESOURCE_TYPE_END_TAG:
-			{
-				Done = TRUE;
-				break;
-			}
 			default:
 			{
+				DPRINT1("Unknown resource type: %d\n", resource->Type);
 				break;
 			}
 		}
@@ -659,7 +652,10 @@
 	ResourceList = (PCM_RESOURCE_LIST)ExAllocatePool(PagedPool, ResourceListSize);
 
 	if (!ResourceList)
-		return FALSE;
+	{
+		ExFreePool(Buffer.Pointer);
+		return STATUS_INSUFFICIENT_RESOURCES;
+	}
 	ResourceList->Count = 1;
 	ResourceList->List[0].InterfaceType = Internal; /* FIXME */
 	ResourceList->List[0].BusNumber = 0; /* We're the only ACPI bus device in the
system */
@@ -669,8 +665,7 @@
 	ResourceDescriptor = ResourceList->List[0].PartialResourceList.PartialDescriptors;
 
 	/* Fill resources list structure */
-	Done = FALSE;
-	while (!Done)
+	while (resource->Type != ACPI_RESOURCE_TYPE_END_TAG)
 	{
 		switch (resource->Type)
 		{
@@ -737,14 +732,8 @@
 				ResourceDescriptor++;
 				break;
 			}
-			case ACPI_RESOURCE_TYPE_END_TAG:
-			{
-				Done = TRUE;
-				break;
-			}
 			default:
 			{
-				DPRINT1("Unhandled resource type\n");
 				break;
 			}
 		}
@@ -761,7 +750,6 @@
      PPDO_DEVICE_DATA     DeviceData,
       PIRP   Irp )
 {
-	BOOLEAN Done;
 	ULONG NumberOfResources = 0;
 	ACPI_STATUS AcpiStatus;
 	ACPI_BUFFER Buffer;
@@ -796,8 +784,7 @@
 
 	resource= Buffer.Pointer;
 	/* Count number of resources */
-	Done = FALSE;
-	while (!Done)
+	while (resource->Type != ACPI_RESOURCE_TYPE_END_TAG)
 	{
 		switch (resource->Type)
 		{
@@ -818,11 +805,6 @@
 				NumberOfResources++;
 				break;
 			}
-			case ACPI_RESOURCE_TYPE_END_TAG:
-			{
-				Done = TRUE;
-				break;
-			}
 			default:
 			{
 				break;
@@ -837,7 +819,7 @@
 	if (!RequirementsList)
 	{
 		ExFreePool(Buffer.Pointer);
-		return STATUS_SUCCESS;
+		return STATUS_INSUFFICIENT_RESOURCES;
 	}
 	RequirementsList->ListSize = RequirementsListSize;
 	RequirementsList->InterfaceType = Internal;
@@ -850,8 +832,7 @@
 	RequirementDescriptor = RequirementsList->List[0].Descriptors;
 
 	/* Fill resources list structure */
-	Done = FALSE;
-	while (!Done)
+	while (resource->Type != ACPI_RESOURCE_TYPE_END_TAG)
 	{
 		switch (resource->Type)
 		{
@@ -920,14 +901,8 @@
 				RequirementDescriptor++;
 				break;
 			}
-			case ACPI_RESOURCE_TYPE_END_TAG:
-			{
-				Done = TRUE;
-				break;
-			}
 			default:
 			{
-				DPRINT1("Unhandled resource type\n");
 				break;
 			}
 		}