[PATCH v9 3/7] hidclass: Improve error handling in get_device_id

[Claire Girka]

From: Claire Girka

Do not assume the underlying driver will return meaningful data, as it
may not support BusQueryContainerID which will be queried in a next commit.
---
 dlls/hidclass.sys/pnp.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/dlls/hidclass.sys/pnp.c b/dlls/hidclass.sys/pnp.c
index 873c55c4a67..91d80f74403 100644
--- a/dlls/hidclass.sys/pnp.c
+++ b/dlls/hidclass.sys/pnp.c
@@ -84,11 +84,15 @@ static NTSTATUS get_device_id(DEVICE_OBJECT *device, BUS_QUERY_ID_TYPE type, WCH
     irpsp->MinorFunction = IRP_MN_QUERY_ID;
     irpsp->Parameters.QueryId.IdType = type;

+    irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
     if (IoCallDriver(device, irp) == STATUS_PENDING)
         KeWaitForSingleObject(&event, Executive, KernelMode, FALSE, NULL);

-    wcscpy(id, (WCHAR *)irp_status.Information);
-    ExFreePool((WCHAR *)irp_status.Information);
+    if (!irp_status.Status) {
+        wcscpy(id, (WCHAR *)irp_status.Information);
+        ExFreePool((WCHAR *)irp_status.Information);
+    }
+
     return irp_status.Status;
 }