Fix SF #762455, segfault when sys.stdout is changed in getattr
Will backport.
diff --git a/Python/ceval.c b/Python/ceval.c
index 07862d0..035520a 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -1501,6 +1501,11 @@
err = -1;
}
}
+ /* PyFile_SoftSpace() can exececute arbitrary code
+ if sys.stdout is an instance with a __getattr__.
+ If __getattr__ raises an exception, w will
+ be freed, so we need to prevent that temporarily. */
+ Py_XINCREF(w);
if (w != NULL && PyFile_SoftSpace(w, 0))
err = PyFile_WriteString(" ", w);
if (err == 0)
@@ -1528,6 +1533,7 @@
else
PyFile_SoftSpace(w, 1);
}
+ Py_XDECREF(w);
Py_DECREF(v);
Py_XDECREF(stream);
stream = NULL;