python · serhiy-storchaka · Mar 15, 2017 · Mar 15, 2017
diff --git a/Lib/test/test_functools.py b/Lib/test/test_functools.py
@@ -387,6 +387,32 @@ def __getitem__(self, key):
        self.assertRaises(TypeError, f.__setstate__, BadSequence())


+    def test_manually_adding_non_string_keyword(self):
+        p = self.partial(capture)
+        # Adding a non-string/unicode keyword to partial kwargs
+        p.keywords[1234] = 'value'
+        r = repr(p)
+        self.assertIn('1234', r)
+        self.assertIn("'value'", r)
+        with self.assertRaises(TypeError):
+            p()
+
+    def test_keystr_replaces_value(self):
+        p = self.partial(capture)
+
+        class MutatesYourDict(object):
+            def __str__(self):
+                p.keywords[self] = ['sth2']
+                return 'astr'
+
+        # Raplacing the value during key formatting should keep the original
+        # value alive (at least long enough).
+        p.keywords[MutatesYourDict()] = ['sth']
+        r = repr(p)
+        self.assertIn('astr', r)
+        self.assertIn("['sth']", r)
+
+
 class TestPartialPy(TestPartial, unittest.TestCase):
    partial = staticmethod(py_functools.partial)


diff --git a/Misc/ACKS b/Misc/ACKS
@@ -1348,6 +1348,7 @@ Federico Schwindt
 Barry Scott
 Steven Scott
 Nick Seidenman
+Michael Seifert
 Žiga Seilnacht
 Yury Selivanov
 Fred Sells

diff --git a/Misc/NEWS b/Misc/NEWS
@@ -43,6 +43,9 @@ Extension Modules
 Library
 -------

+- bpo-29800: Fix crashes in partial.__repr__ if the keys of partial.keywords
+  are not strings.  Patch by Michael Seifert.
+
 - bpo-29742: get_extra_info() raises exception if get called on closed ssl transport.
  Patch by Nikolay Kim.


diff --git a/Modules/_functoolsmodule.c b/Modules/_functoolsmodule.c
@@ -234,8 +234,11 @@ partial_repr(partialobject *pto)
    /* Pack keyword arguments */
    assert (PyDict_Check(pto->kw));
    for (i = 0; PyDict_Next(pto->kw, &i, &key, &value);) {
-        Py_SETREF(arglist, PyUnicode_FromFormat("%U, %U=%R", arglist,
+        /* Prevent key.__str__ from deleting the value. */
+        Py_INCREF(value);
+        Py_SETREF(arglist, PyUnicode_FromFormat("%U, %S=%R", arglist,
                                                key, value));
+        Py_DECREF(value);
        if (arglist == NULL)
            goto done;
    }