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hidclass: Only access Tail.Overlay.OriginalFileObject when needed.

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Rémi Bernon 2024-01-14 18:04:56 +01:00 committed by Alexandre Julliard
parent 677107956f
commit 8db5dec9d2
1 changed files with 4 additions and 1 deletions
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5
dlls/hidclass.sys/device.c
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@ -527,7 +527,6 @@ static NTSTATUS hid_device_xfer_report( BASE_DEVICE_EXTENSION *ext, ULONG code,
NTSTATUS WINAPI pdo_ioctl(DEVICE_OBJECT *device, IRP *irp)
{
struct hid_queue *queue = irp->Tail.Overlay.OriginalFileObject->FsContext;
IO_STACK_LOCATION *irpsp = IoGetCurrentIrpStackLocation( irp );
BASE_DEVICE_EXTENSION *ext = device->DeviceExtension;
NTSTATUS status = irp->IoStatus.Status;
@ -637,7 +636,10 @@ NTSTATUS WINAPI pdo_ioctl(DEVICE_OBJECT *device, IRP *irp)
if (irpsp->Parameters.DeviceIoControl.InputBufferLength != sizeof(ULONG))
status = STATUS_BUFFER_OVERFLOW;
else
{
struct hid_queue *queue = irp->Tail.Overlay.OriginalFileObject->FsContext;
status = hid_queue_resize( queue, *(ULONG *)irp->AssociatedIrp.SystemBuffer );
}
break;
}
case IOCTL_GET_NUM_DEVICE_INPUT_BUFFERS:
@ -646,6 +648,7 @@ NTSTATUS WINAPI pdo_ioctl(DEVICE_OBJECT *device, IRP *irp)
status = STATUS_BUFFER_TOO_SMALL;
else
{
struct hid_queue *queue = irp->Tail.Overlay.OriginalFileObject->FsContext;
*(ULONG *)irp->AssociatedIrp.SystemBuffer = queue->length;
irp->IoStatus.Information = sizeof(ULONG);
status = STATUS_SUCCESS;