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hidclass: Only access Tail.Overlay.OriginalFileObject when needed.
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parent
677107956f
commit
8db5dec9d2
1 changed files with 4 additions and 1 deletions
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@ -527,7 +527,6 @@ static NTSTATUS hid_device_xfer_report( BASE_DEVICE_EXTENSION *ext, ULONG code,
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NTSTATUS WINAPI pdo_ioctl(DEVICE_OBJECT *device, IRP *irp)
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{
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struct hid_queue *queue = irp->Tail.Overlay.OriginalFileObject->FsContext;
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IO_STACK_LOCATION *irpsp = IoGetCurrentIrpStackLocation( irp );
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BASE_DEVICE_EXTENSION *ext = device->DeviceExtension;
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NTSTATUS status = irp->IoStatus.Status;
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@ -637,7 +636,10 @@ NTSTATUS WINAPI pdo_ioctl(DEVICE_OBJECT *device, IRP *irp)
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if (irpsp->Parameters.DeviceIoControl.InputBufferLength != sizeof(ULONG))
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status = STATUS_BUFFER_OVERFLOW;
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else
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{
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struct hid_queue *queue = irp->Tail.Overlay.OriginalFileObject->FsContext;
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status = hid_queue_resize( queue, *(ULONG *)irp->AssociatedIrp.SystemBuffer );
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}
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break;
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}
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case IOCTL_GET_NUM_DEVICE_INPUT_BUFFERS:
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@ -646,6 +648,7 @@ NTSTATUS WINAPI pdo_ioctl(DEVICE_OBJECT *device, IRP *irp)
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status = STATUS_BUFFER_TOO_SMALL;
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else
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{
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struct hid_queue *queue = irp->Tail.Overlay.OriginalFileObject->FsContext;
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*(ULONG *)irp->AssociatedIrp.SystemBuffer = queue->length;
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irp->IoStatus.Information = sizeof(ULONG);
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status = STATUS_SUCCESS;
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