Avoid clobbering class variables when setting instance options

diff --git a/controller.c b/controller.c
index c196dad71c9bbfcb47c94ebd3c965765ddde9882..d8325ac285988c536d7237f0f8abd5510aa9bfa9 100644 (file)
--- a/controller.c
+++ b/controller.c
@@ -326,8 +326,18 @@ SRD_API int srd_inst_option_set(struct srd_decoder_inst *di,
        /* All of these are synthesized objects, so they're good. */
        py_dec_optkeys = PyDict_Keys(py_dec_options);
        num_optkeys = PyList_Size(py_dec_optkeys);
+
+       /*
+        * The 'options' dictionary is a class variable, but we need to
+        * change it. Changing it directly will affect the entire class,
+        * so we need to create a new object for it, and populate that
+        * instead.
+        */
        if (!(py_di_options = PyObject_GetAttrString(di->py_inst, "options")))
                goto err_out;
+       Py_DECREF(py_di_options);
+       py_di_options = PyDict_New();
+       PyObject_SetAttrString(di->py_inst, "options", py_di_options);
        for (i = 0; i < num_optkeys; i++) {
                /* Get the default class value for this option. */
                py_str_as_str(PyList_GetItem(py_dec_optkeys, i), &key);