[Python-checkins] bpo-34068: _io__IOBase_close_impl could call _PyObject_SetAttrId with an exception set (GH-8282)
Serhiy Storchaka
webhook-mailer at python.org
Tue Jul 17 02:31:50 EDT 2018
https://github.com/python/cpython/commit/28f07364f066792ceee93231dbb80ae8ad98b2bb
commit: 28f07364f066792ceee93231dbb80ae8ad98b2bb
branch: master
author: Zackery Spytz <zspytz at gmail.com>
committer: Serhiy Storchaka <storchaka at gmail.com>
date: 2018-07-17T09:31:44+03:00
summary:
bpo-34068: _io__IOBase_close_impl could call _PyObject_SetAttrId with an exception set (GH-8282)
files:
A Misc/NEWS.d/next/Core and Builtins/2018-07-14-08-58-46.bpo-34068.9xfM55.rst
M Lib/test/test_io.py
M Modules/_io/iobase.c
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index a03a7f78109c..c68b2fea858b 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -968,6 +968,16 @@ def read1(self, size):
self.assertSequenceEqual(buffer[result:], unused)
self.assertEqual(len(reader.avail), avail - result)
+ def test_close_assert(self):
+ class R(self.IOBase):
+ def __setattr__(self, name, value):
+ pass
+ def flush(self):
+ raise OSError()
+ f = R()
+ # This would cause an assertion failure.
+ self.assertRaises(OSError, f.close)
+
class CIOTest(IOTest):
diff --git a/Misc/NEWS.d/next/Core and Builtins/2018-07-14-08-58-46.bpo-34068.9xfM55.rst b/Misc/NEWS.d/next/Core and Builtins/2018-07-14-08-58-46.bpo-34068.9xfM55.rst
new file mode 100644
index 000000000000..0ed8ff91925a
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2018-07-14-08-58-46.bpo-34068.9xfM55.rst
@@ -0,0 +1,3 @@
+In :meth:`io.IOBase.close`, ensure that the :attr:`~io.IOBase.closed`
+attribute is not set with a live exception. Patch by Zackery Spytz and Serhiy
+Storchaka.
diff --git a/Modules/_io/iobase.c b/Modules/_io/iobase.c
index 0c329bff840b..5b71732ef19c 100644
--- a/Modules/_io/iobase.c
+++ b/Modules/_io/iobase.c
@@ -224,8 +224,8 @@ static PyObject *
_io__IOBase_close_impl(PyObject *self)
/*[clinic end generated code: output=63c6a6f57d783d6d input=f4494d5c31dbc6b7]*/
{
- PyObject *res;
- int closed = iobase_is_closed(self);
+ PyObject *res, *exc, *val, *tb;
+ int rc, closed = iobase_is_closed(self);
if (closed < 0) {
return NULL;
@@ -236,9 +236,11 @@ _io__IOBase_close_impl(PyObject *self)
res = PyObject_CallMethodObjArgs(self, _PyIO_str_flush, NULL);
- if (_PyObject_SetAttrId(self, &PyId___IOBase_closed, Py_True) < 0) {
- Py_XDECREF(res);
- return NULL;
+ PyErr_Fetch(&exc, &val, &tb);
+ rc = _PyObject_SetAttrId(self, &PyId___IOBase_closed, Py_True);
+ _PyErr_ChainExceptions(exc, val, tb);
+ if (rc < 0) {
+ Py_CLEAR(res);
}
if (res == NULL)
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