Issue #10989: Fix a crash on SSLContext.load_verify_locations(None, True).

Patch reviewed by Antoine Pitrou, okayed by Georg Brandl.

Lib/test/test_ssl.py

@@ -394,6 +394,9 @@ def test_load_verify_locations(self):
         ctx.load_verify_locations(CERTFILE, CAPATH)
         ctx.load_verify_locations(CERTFILE, capath=BYTES_CAPATH)
 
+        # Issue #10989: crash if the second argument type is invalid
+        self.assertRaises(TypeError, ctx.load_verify_locations, None, True)
+
     @skip_if_broken_ubuntu_ssl
     def test_session_stats(self):
         for proto in PROTOCOLS:

Misc/NEWS

@@ -16,6 +16,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #10989: Fix a crash on SSLContext.load_verify_locations(None, True).
+
 - Issue #11020: Command-line pyclbr was broken because of missing 2-to-3
   conversion.
 

Modules/_ssl.c

@@ -1683,7 +1683,7 @@ load_verify_locations(PySSLContext *self, PyObject *args, PyObject *kwds)
         return NULL;
     }
     if (capath && !PyUnicode_FSConverter(capath, &capath_bytes)) {
-        Py_DECREF(cafile_bytes);
+        Py_XDECREF(cafile_bytes);
         PyErr_SetString(PyExc_TypeError,
                         "capath should be a valid filesystem path");
         return NULL;