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

2 files changed, 9 insertions, 3 deletions

diff --git a/Python/ast.c b/Python/ast.c
index 5b7ed7c..d36a9b7 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -2024,16 +2024,18 @@ 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 {
                     PyOS_snprintf(buf, sizeof(buf), "(%s) unknown error", errtype);
                 }
+                Py_XDECREF(errstr);
                 ast_error(c, n, buf);
                 Py_DECREF(type);
                 Py_XDECREF(value);
diff --git a/Python/importdl.c b/Python/importdl.c
index 1aa585d..ea4f0e7 100644
--- a/Python/importdl.c
+++ b/Python/importdl.c
@@ -147,6 +147,10 @@ _PyImport_LoadDynamicModuleWithSpec(PyObject *spec, FILE *fp)
     /* Package context is needed for single-phase init */
     oldcontext = _Py_PackageContext;
     _Py_PackageContext = PyUnicode_AsUTF8(name_unicode);
+    if (_Py_PackageContext == NULL) {
+        _Py_PackageContext = oldcontext;
+        goto error;
+    }
     m = p0();
     _Py_PackageContext = oldcontext;