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[NTOS:PNP] Avoid a fixed-length stack buffer in IopActionConfigureChildServices. CORE-15882

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Thomas Faber 2019-03-24 15:04:37 +01:00
parent e1b20681f5
commit ccb91bebbe
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1 changed files with 14 additions and 6 deletions
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20
ntoskrnl/io/pnpmgr/pnpmgr.c
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@ -2854,16 +2854,11 @@ IopActionConfigureChildServices(PDEVICE_NODE DeviceNode,
if (!(DeviceNode->Flags & (DNF_DISABLED | DNF_STARTED | DNF_ADDED)))
{
WCHAR RegKeyBuffer[MAX_PATH];
UNICODE_STRING RegKey;
/* Install the service for this if it's in the CDDB */
IopInstallCriticalDevice(DeviceNode);
RegKey.Length = 0;
RegKey.MaximumLength = sizeof(RegKeyBuffer);
RegKey.Buffer = RegKeyBuffer;
/*
* Retrieve configuration from Enum key
*/
@ -2885,11 +2880,24 @@ IopActionConfigureChildServices(PDEVICE_NODE DeviceNode,
QueryTable[1].DefaultData = L"";
QueryTable[1].DefaultLength = 0;
RtlAppendUnicodeToString(&RegKey, L"\\Registry\\Machine\\System\\CurrentControlSet\\Enum\\");
RegKey.Length = 0;
RegKey.MaximumLength = sizeof(ENUM_ROOT) + sizeof(WCHAR) + DeviceNode->InstancePath.Length;
RegKey.Buffer = ExAllocatePoolWithTag(PagedPool,
RegKey.MaximumLength,
TAG_IO);
if (RegKey.Buffer == NULL)
{
IopDeviceNodeSetFlag(DeviceNode, DNF_DISABLED);
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlAppendUnicodeToString(&RegKey, ENUM_ROOT);
RtlAppendUnicodeToString(&RegKey, L"\\");
RtlAppendUnicodeStringToString(&RegKey, &DeviceNode->InstancePath);
Status = RtlQueryRegistryValues(RTL_REGISTRY_ABSOLUTE,
RegKey.Buffer, QueryTable, NULL, NULL);
ExFreePoolWithTag(RegKey.Buffer, TAG_IO);
if (!NT_SUCCESS(Status))
{