Issue #28715: Added error checks for PyUnicode_AsUTF8().

1 files changed, 5 insertions, 3 deletions

diff --git a/Python/ast.c b/Python/ast.c
index 33b7df64ec..82f4529bf9 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -2118,17 +2118,19 @@ ast_for_atom(struct compiling *c, const node *n)
                 errtype = "value error";
             if (errtype) {
                 char buf[128];
+                const char *s = NULL;
                 PyObject *type, *value, *tback, *errstr;
                 PyErr_Fetch(&type, &value, &tback);
                 errstr = PyObject_Str(value);
-                if (errstr) {
-                    char *s = _PyUnicode_AsString(errstr);
+                if (errstr)
+                    s = PyUnicode_AsUTF8(errstr);
+                if (s) {
                     PyOS_snprintf(buf, sizeof(buf), "(%s) %s", errtype, s);
-                    Py_DECREF(errstr);
                 } else {
                     PyErr_Clear();
                     PyOS_snprintf(buf, sizeof(buf), "(%s) unknown error", errtype);
                 }
+                Py_XDECREF(errstr);
                 ast_error(c, n, buf);
                 Py_DECREF(type);
                 Py_XDECREF(value);