[hbelusca] 66965: [ACPI:BUS]: Fix dereferencing NULL pointers in acpi_bus_notify. By Victor Martinez with small adaptation by me. CORE-8271

Author: hbelusca
Date: Sun Mar 29 15:49:03 2015
New Revision: 66965

URL: http://svn.reactos.org/svn/reactos?rev=66965&view=rev
Log:
[ACPI:BUS]: Fix dereferencing NULL pointers in acpi_bus_notify. By Victor Martinez with
small adaptation by me.
CORE-8271

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

Modified: trunk/reactos/drivers/bus/acpi/busmgr/bus.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/bus/acpi/busmgr/bu…
==============================================================================
--- trunk/reactos/drivers/bus/acpi/busmgr/bus.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/bus/acpi/busmgr/bus.c	[iso-8859-1] Sun Mar 29 15:49:03 2015
@@ -721,11 +721,13 @@
 	//blocking_notifier_call_chain(&acpi_bus_notify_list,
 	//	type, (void *)handle);
 
+	acpi_bus_get_device(handle, &device);
+
 	switch (type) {
 
 	case ACPI_NOTIFY_BUS_CHECK:
 		DPRINT("Received BUS CHECK notification for device [%s]\n",
-			device->pnp.bus_id);
+			device ? device->pnp.bus_id : "n/a");
 		acpi_bus_check_scope(handle);
 		/*
 		 * TBD: We'll need to outsource certain events to non-ACPI
@@ -735,7 +737,7 @@
 
 	case ACPI_NOTIFY_DEVICE_CHECK:
 		DPRINT("Received DEVICE CHECK notification for device [%s]\n",
-			device->pnp.bus_id);
+			device ? device->pnp.bus_id : "n/a");
 		acpi_bus_check_device(handle);
 		/*
 		 * TBD: We'll need to outsource certain events to non-ACPI
@@ -745,7 +747,7 @@
 
 	case ACPI_NOTIFY_DEVICE_WAKE:
 		DPRINT("Received DEVICE WAKE notification for device [%s]\n",
-			device->pnp.bus_id);
+			device ? device->pnp.bus_id : "n/a");
 		acpi_bus_check_device(handle);
 		/*
 		 * TBD: We'll need to outsource certain events to non-ACPI
@@ -755,41 +757,40 @@
 
 	case ACPI_NOTIFY_EJECT_REQUEST:
 		DPRINT1("Received EJECT REQUEST notification for device [%s]\n",
-			device->pnp.bus_id);
+			device ? device->pnp.bus_id : "n/a");
 		/* TBD */
 		break;
 
 	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 		DPRINT1("Received DEVICE CHECK LIGHT notification for device [%s]\n",
-			device->pnp.bus_id);
+			device ? device->pnp.bus_id : "n/a");
 		/* TBD: Exactly what does 'light' mean? */
 		break;
 
 	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 		DPRINT1("Received FREQUENCY MISMATCH notification for device [%s]\n",
-			device->pnp.bus_id);
+			device ? device->pnp.bus_id : "n/a");
 		/* TBD */
 		break;
 
 	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 		DPRINT1("Received BUS MODE MISMATCH notification for device [%s]\n",
-			device->pnp.bus_id);
+			device ? device->pnp.bus_id : "n/a");
 		/* TBD */
 		break;
 
 	case ACPI_NOTIFY_POWER_FAULT:
 		DPRINT1("Received POWER FAULT notification for device [%s]\n",
-			device->pnp.bus_id);
+			device ? device->pnp.bus_id : "n/a");
 		/* TBD */
 		break;
 
 	default:
-		DPRINT1("Received unknown/unsupported notification [%08x]\n",
-			type);
-		break;
-	}
-
-	acpi_bus_get_device(handle, &device);
+		DPRINT1("Received unknown/unsupported notification [%08x] for device
[%s]\n",
+			type, device ? device->pnp.bus_id : "n/a");
+		break;
+	}
+
 	if (device) {
 		driver = device->driver;
 		if (driver && driver->ops.notify &&
@@ -1672,7 +1673,7 @@
 	/*
 	 * Register the for all standard device notifications.
 	 */
-	status = AcpiInstallNotifyHandler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
&acpi_bus_notify, NULL);
+	status = AcpiInstallNotifyHandler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, acpi_bus_notify,
NULL);
 	if (ACPI_FAILURE(status)) {
 		DPRINT1("Unable to register for device notifications\n");
 		result = AE_NOT_FOUND;
@@ -1703,7 +1704,7 @@
 	/* Mimic structured exception handling */
 error2:
 	AcpiRemoveNotifyHandler(ACPI_ROOT_OBJECT,
-		ACPI_SYSTEM_NOTIFY, &acpi_bus_notify);
+		ACPI_SYSTEM_NOTIFY, acpi_bus_notify);
 error1:
 	AcpiTerminate();
 	return_VALUE(AE_NOT_FOUND);
@@ -1752,7 +1753,7 @@
 
 	DPRINT("Subsystem revision %08x\n",ACPI_CA_VERSION);
 
-        KeInitializeSpinLock(&acpi_bus_event_lock);
+	KeInitializeSpinLock(&acpi_bus_event_lock);
 	KeInitializeEvent(&AcpiEventQueue, NotificationEvent, FALSE);
 	ExInitializeFastMutex(&acpi_bus_drivers_lock);