pykms: keep Card alive until Blob is gone

diff --git a/py/pykms/pykmsbase.cpp b/py/pykms/pykmsbase.cpp
index aae5ecec6ea32e31f5361ec6a52874064ab5c7ee..96ebe7a0858d375eabca40acf6a80559ebc0ca75 100644 (file)
--- a/py/pykms/pykmsbase.cpp
+++ b/py/pykms/pykmsbase.cpp
@@ -105,12 +105,14 @@ void init_pykmsbase(py::module &m)
 
        py::class_<Blob>(m, "Blob")
                        .def("__init__", [](Blob& instance, Card& card, py::buffer buf) {
-                               py::buffer_info info = buf.request();
-                               if (info.ndim != 1)
-                                       throw std::runtime_error("Incompatible buffer dimension!");
+                                       py::buffer_info info = buf.request();
+                                       if (info.ndim != 1)
+                                               throw std::runtime_error("Incompatible buffer dimension!");
+
+                                       new (&instance) Blob(card, info.ptr, info.size * info.itemsize);
+                               },
+                               py::keep_alive<1, 3>()) // Keep Card alive until this is destructed
 
-                               new (&instance) Blob(card, info.ptr, info.size * info.itemsize);
-                       })
                        .def_property_readonly("data", &Blob::data)
 
                        // XXX pybind11 doesn't support a base object (DrmObject) with custom holder-type,