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gh-122888: Fix crash on certain calls to str() #122889

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merged 4 commits into from
Aug 12, 2024
Merged

gh-122888: Fix crash on certain calls to str() #122889

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6624420
gh-122888: Fix crash on certain calls to str()
JelleZijlstra Aug 10, 2024
e2d9bf7
Improve tests
JelleZijlstra Aug 10, 2024
6456846
unify and extend tests
JelleZijlstra Aug 11, 2024
bfff977
clean up test
JelleZijlstra Aug 12, 2024
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12 changes: 12 additions & 0 deletions Lib/test/test_str.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1747,6 +1747,18 @@ def test_constructor_keyword_args(self):
self.assertEqual(str(b'foo', errors='strict'), 'foo') # not "b'foo'"
self.assertEqual(str(object=b'foo', errors='strict'), 'foo')

def test_constructor_errors(self):
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with self.assertRaisesRegex(TypeError, r"str\(\) argument 'encoding' must be str, not bytes"):
str(b"x", b"ascii")
with self.assertRaisesRegex(TypeError, r"str\(\) argument 'encoding' must be str, not bytes"):
str(b"x", encoding=b"ascii")
with self.assertRaisesRegex(TypeError, r"str\(\) argument 'errors' must be str, not bytes"):
str(b"x", "ascii", b"strict")
with self.assertRaisesRegex(TypeError, r"str\(\) argument 'errors' must be str, not bytes"):
str(b"x", "ascii", errors=b"strict")
with self.assertRaisesRegex(TypeError, r"str expected at most 3 arguments, got 4"):
str("too", "many", "argu", "ments")

def test_constructor_defaults(self):
"""Check the constructor argument defaults."""
# The object argument defaults to '' or b''.
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2024-08-10-12-44-03.gh-issue-122888.TUyu9r.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix crash on certain calls to ``str()`` with positional arguments of the
wrong type. Patch by Jelle Zijlstra.
11 changes: 10 additions & 1 deletion Objects/unicodeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -15121,7 +15121,16 @@ unicode_vectorcall(PyObject *type, PyObject *const *args,
return PyObject_Str(object);
}
const char *encoding = arg_as_utf8(args[1], "encoding");
const char *errors = (nargs == 3) ? arg_as_utf8(args[2], "errors") : NULL;
if (encoding == NULL) {
return NULL;
}
const char *errors = NULL;
if (nargs == 3) {
errors = arg_as_utf8(args[2], "errors");
if (errors == NULL) {
return NULL;
}
}
return PyUnicode_FromEncodedObject(object, encoding, errors);
}

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