From 560a79f94e94de66a18f2a5e4194c2fe51e2adf1 Mon Sep 17 00:00:00 2001
From: Dong-hee Na <donghee.na@python.org>
Date: Mon, 11 Oct 2021 20:08:38 +0900
Subject: Handle error when PyUnicode_GetLength returns a negative value.
 (GH-28859)

---
 Python/importdl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Python/importdl.c b/Python/importdl.c
index 27ffc64..3d9cd1a 100644
--- a/Python/importdl.c
+++ b/Python/importdl.c
@@ -42,6 +42,9 @@ get_encoded_name(PyObject *name, const char **hook_prefix) {
 
     /* Get the short name (substring after last dot) */
     name_len = PyUnicode_GetLength(name);
+    if (name_len < 0) {
+        return NULL;
+    }
     lastdot = PyUnicode_FindChar(name, '.', 0, name_len, -1);
     if (lastdot < -1) {
         return NULL;
-- 
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