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[NTOSKRNL]

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- Fix NULL termination of strings in IoGetDeviceProperty
- Fixes garbage displayed in the Enumerator field of the device manager property page

svn path=/trunk/; revision=53232
This commit is contained in:
Cameron Gutman 2011-08-14 14:44:34 +00:00
parent 704a9a3f49
commit 53e9ff45bf
1 changed files with 14 additions and 7 deletions
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21
reactos/ntoskrnl/io/pnpmgr/pnpmgr.c
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@ -3467,6 +3467,8 @@ IoGetDeviceProperty(IN PDEVICE_OBJECT DeviceObject,
NTSTATUS Status = STATUS_BUFFER_TOO_SMALL;
GUID BusTypeGuid;
POBJECT_NAME_INFORMATION ObjectNameInfo = NULL;
BOOLEAN NullTerminate = FALSE;
DPRINT("IoGetDeviceProperty(0x%p %d)\n", DeviceObject, DeviceProperty);
/* Assume failure */
@ -3517,7 +3519,10 @@ IoGetDeviceProperty(IN PDEVICE_OBJECT DeviceObject,
/* Get the name from the path */
EnumeratorNameEnd = wcschr(DeviceInstanceName, OBJ_NAME_PATH_SEPARATOR);
ASSERT(EnumeratorNameEnd);
/* This string needs to be NULL-terminated */
NullTerminate = TRUE;
/* This is the format of the returned data */
PIP_RETURN_DATA((EnumeratorNameEnd - DeviceInstanceName) * sizeof(WCHAR),
DeviceInstanceName);
@ -3567,7 +3572,10 @@ IoGetDeviceProperty(IN PDEVICE_OBJECT DeviceObject,
/* It's up to the caller to try again */
Status = STATUS_BUFFER_TOO_SMALL;
}
/* This string needs to be NULL-terminated */
NullTerminate = TRUE;
/* Return if successful */
if (NT_SUCCESS(Status)) PIP_RETURN_DATA(ObjectNameInfo->Name.Length,
ObjectNameInfo->Name.Buffer);
@ -3633,15 +3641,14 @@ IoGetDeviceProperty(IN PDEVICE_OBJECT DeviceObject,
else if (NT_SUCCESS(Status))
{
/* We know up-front how much data to expect, check the caller's buffer */
*ResultLength = ReturnLength;
if (ReturnLength <= BufferLength)
*ResultLength = ReturnLength + (NullTerminate ? sizeof(UNICODE_NULL) : 0);
if (*ResultLength <= BufferLength)
{
/* Buffer is all good, copy the data */
RtlCopyMemory(PropertyBuffer, Data, ReturnLength);
/* Check for properties that require a null-terminated string */
if ((DeviceProperty == DevicePropertyEnumeratorName) ||
(DeviceProperty == DevicePropertyPhysicalDeviceObjectName))
/* Check if we need to NULL-terminate the string */
if (NullTerminate)
{
/* Terminate the string */
((PWCHAR)PropertyBuffer)[ReturnLength / sizeof(WCHAR)] = UNICODE_NULL;