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issue #0002996: PyObjectBase notification chain can lead to unexpected changes to document

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This commit is contained in:
wmayer
2017-04-27 15:09:28 +02:00
parent 6368b2f822
commit a2dd176bc2
2 changed files with 71 additions and 32 deletions
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67
src/Base/PyObjectBase.cpp
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@@ -292,16 +292,18 @@ void PyObjectBase::resetAttribute()
if (attrDict) {
// This is the attribute name to the parent structure
// which we search for in the dict
PyObject* key = PyString_FromString("__attribute_of_parent__");
PyObject* attr = PyDict_GetItem(attrDict, key);
PyObject* key1 = PyString_FromString("__attribute_of_parent__");
PyObject* key2 = PyString_FromString("__instance_of_parent__");
PyObject* attr = PyDict_GetItem(attrDict, key1);
PyObject* inst = PyDict_GetItem(attrDict, key2);
if (attr) {
PyObject* parent = PyDict_GetItem(attrDict, attr);
if (parent) {
PyDict_DelItem(attrDict, attr);
}
PyDict_DelItem(attrDict, key);
PyDict_DelItem(attrDict, key1);
}
Py_DECREF(key);
if (inst) {
PyDict_DelItem(attrDict, key2);
}
Py_DECREF(key1);
Py_DECREF(key2);
}
}
@@ -311,12 +313,14 @@ void PyObjectBase::setAttributeOf(const char* attr, PyObject* par)
attrDict = PyDict_New();
}
PyObject* key = PyString_FromString("__attribute_of_parent__");
PyObject* key1 = PyString_FromString("__attribute_of_parent__");
PyObject* key2 = PyString_FromString("__instance_of_parent__");
PyObject* attro = PyString_FromString(attr);
PyDict_SetItem(attrDict, key, attro);
PyDict_SetItem(attrDict, attro, par);
PyDict_SetItem(attrDict, key1, attro);
PyDict_SetItem(attrDict, key2, par);
Py_DECREF(attro);
Py_DECREF(key);
Py_DECREF(key1);
Py_DECREF(key2);
}
void PyObjectBase::startNotify()
@@ -324,30 +328,29 @@ void PyObjectBase::startNotify()
if (attrDict) {
// This is the attribute name to the parent structure
// which we search for in the dict
PyObject* key = PyString_FromString("__attribute_of_parent__");
PyObject* attr = PyDict_GetItem(attrDict, key);
if (attr) {
PyObject* parent = PyDict_GetItem(attrDict, attr);
if (parent) {
// Inside __setattr of the parent structure the 'attr'
// is being removed from the dict and thus its reference
// counter will be decremented. To avoid to be deleted we
// must tmp. increment it and afterwards decrement it again.
Py_INCREF(parent);
Py_INCREF(attr);
Py_INCREF(this);
PyObject* key1 = PyString_FromString("__attribute_of_parent__");
PyObject* key2 = PyString_FromString("__instance_of_parent__");
PyObject* attr = PyDict_GetItem(attrDict, key1);
PyObject* parent = PyDict_GetItem(attrDict, key2);
if (attr && parent) {
// Inside __setattr of the parent structure the 'attr'
// is being removed from the dict and thus its reference
// counter will be decremented. To avoid to be deleted we
// must tmp. increment it and afterwards decrement it again.
Py_INCREF(parent);
Py_INCREF(attr);
Py_INCREF(this);
__setattr(parent, PyString_AsString(attr), this);
__setattr(parent, PyString_AsString(attr), this);
Py_DECREF(parent); // might be destroyed now
Py_DECREF(attr); // might be destroyed now
Py_DECREF(this); // might be destroyed now
Py_DECREF(parent); // might be destroyed now
Py_DECREF(attr); // might be destroyed now
Py_DECREF(this); // might be destroyed now
if (PyErr_Occurred())
PyErr_Clear();
}
if (PyErr_Occurred())
PyErr_Clear();
}
Py_DECREF(key);
Py_DECREF(key1);
}
}