[cgutman] 56196: [NTOSKRNL] - Fix opening of handles to enumerated devices (revert 53351 which ironically fixed this same bug) - Fixes bug 6939

Author: cgutman
Date: Tue Mar 20 17:04:36 2012
New Revision: 56196

URL: http://svn.reactos.org/svn/reactos?rev=56196&view=rev
Log:
[NTOSKRNL]
- Fix opening of handles to enumerated devices (revert 53351 which ironically fixed this same bug)
- Fixes bug 6939

Modified:
    trunk/reactos/ntoskrnl/po/events.c

Modified: trunk/reactos/ntoskrnl/po/events.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/po/events.c?rev=56...
==============================================================================
--- trunk/reactos/ntoskrnl/po/events.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/po/events.c [iso-8859-1] Tue Mar 20 17:04:36 2012
@@ -162,6 +162,8 @@
    BOOLEAN Arrival;
    ULONG Caps;
    NTSTATUS Status;
+    UNICODE_STRING DeviceName;
+	UNICODE_STRING DeviceNamePrefix = RTL_CONSTANT_STRING(L"\??\");

DPRINT("PopAddRemoveSysCapsCallback(%p %p)\n",
    	NotificationStructure, Context);
@@ -182,10 +184,20 @@
    {
    	DPRINT("Arrival of %wZ\n", Notification->SymbolicLinkName);

+        DeviceName.Length = 0;
+		DeviceName.MaximumLength = Notification->SymbolicLinkName->MaximumLength + DeviceNamePrefix.MaximumLength;
+		DeviceName.Buffer = ExAllocatePool(PagedPool, DeviceName.MaximumLength);
+		if (!DeviceName.Buffer) return STATUS_INSUFFICIENT_RESOURCES;
+
+		RtlCopyUnicodeString(&DeviceName, &DeviceNamePrefix);
+		RtlAppendUnicodeStringToString(&DeviceName, Notification->SymbolicLinkName);
+
+		DPRINT("Opening handle to %wZ\n", &DeviceName);
+
    	/* Open the device */
    	InitializeObjectAttributes(
    		&ObjectAttributes,
-			Notification->SymbolicLinkName,
+			&DeviceName,
    		OBJ_KERNEL_HANDLE,
    		NULL,
    		NULL);
@@ -196,6 +208,7 @@
    		&IoStatusBlock,
    		FILE_SHARE_READ | FILE_SHARE_WRITE,
    		0);
+        RtlFreeUnicodeString(&DeviceName);
    	if (!NT_SUCCESS(Status))
    	{
    		DPRINT1("ZwOpenFile() failed with status 0x%08lx\n", Status);