#19395: Raise exception when pickling a (BZ2|LZMA)(Compressor|Decompressor).

The underlying C libraries provide no mechanism for serializing compressor and
decompressor objects, so actually pickling these classes is impractical.
Previously, these objects would be pickled without error, but attempting to use
a deserialized instance would segfault the interpreter.

1 files changed, 2 insertions, 0 deletions

diff --git a/Python/importdl.c b/Python/importdl.c
index 0ea954cae0..b60f1c75fb 100644
--- a/Python/importdl.c
+++ b/Python/importdl.c
@@ -77,6 +77,8 @@ _PyImport_LoadDynamicModule(PyObject *name, PyObject *path, FILE *fp)
         PyObject *msg = PyUnicode_FromFormat("dynamic module does not define "
                                              "init function (PyInit_%s)",
                                              shortname);
+        if (msg == NULL)
+            goto error;
         PyErr_SetImportError(msg, name, path);
         Py_DECREF(msg);
         goto error;