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[3.6] bpo-33330: Improve error handling in PyImport_Cleanup(). (GH-6564). #6604

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Merged
serhiy-storchaka merged 1 commit into from
Apr 26, 2018
Merged

[3.6] bpo-33330: Improve error handling in PyImport_Cleanup(). (GH-6564). #6604

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28 changes: 20 additions & 8 deletions Python/import.c
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Original file line number Diff line number Diff line change
Expand Up @@ -354,20 +354,26 @@ PyImport_Cleanup(void)

if (Py_VerboseFlag)
PySys_WriteStderr("# clear builtins._\n");
PyDict_SetItemString(interp->builtins, "_", Py_None);
if (PyDict_SetItemString(interp->builtins, "_", Py_None) < 0) {
PyErr_Clear();
}

for (p = sys_deletes; *p != NULL; p++) {
if (Py_VerboseFlag)
PySys_WriteStderr("# clear sys.%s\n", *p);
PyDict_SetItemString(interp->sysdict, *p, Py_None);
if (PyDict_SetItemString(interp->sysdict, *p, Py_None) < 0) {
PyErr_Clear();
}
}
for (p = sys_files; *p != NULL; p+=2) {
if (Py_VerboseFlag)
PySys_WriteStderr("# restore sys.%s\n", *p);
value = PyDict_GetItemString(interp->sysdict, *(p+1));
if (value == NULL)
value = Py_None;
PyDict_SetItemString(interp->sysdict, *p, value);
if (PyDict_SetItemString(interp->sysdict, *p, value) < 0) {
PyErr_Clear();
}
}

/* We prepare a list which will receive (name, weakref) tuples of
Expand All @@ -381,14 +387,17 @@ PyImport_Cleanup(void)
#define STORE_MODULE_WEAKREF(name, mod) \
if (weaklist != NULL) { \
PyObject *wr = PyWeakref_NewRef(mod, NULL); \
if (name && wr) { \
if (wr) { \
PyObject *tup = PyTuple_Pack(2, name, wr); \
PyList_Append(weaklist, tup); \
if (!tup || PyList_Append(weaklist, tup) < 0) { \
PyErr_Clear(); \
} \
Py_XDECREF(tup); \
Py_DECREF(wr); \
} \
Py_XDECREF(wr); \
if (PyErr_Occurred()) \
else { \
PyErr_Clear(); \
} \
}

/* Remove all modules from sys.modules, hoping that garbage collection
Expand All @@ -399,7 +408,9 @@ PyImport_Cleanup(void)
if (Py_VerboseFlag && PyUnicode_Check(key))
PySys_FormatStderr("# cleanup[2] removing %U\n", key);
STORE_MODULE_WEAKREF(key, value);
PyDict_SetItem(modules, key, Py_None);
if (PyDict_SetItem(modules, key, Py_None) < 0) {
PyErr_Clear();
}
}
}

Expand Down Expand Up @@ -472,6 +483,7 @@ PyImport_Cleanup(void)
/* Once more */
_PyGC_CollectNoFail();

#undef CLEAR_MODULE
#undef STORE_MODULE_WEAKREF
}

Expand Down