Handle error when PyUnicode_GetLength returns a negative value. (GH-28859)

diff --git a/Python/importdl.c b/Python/importdl.c
index 27ffc64284098e6e8e2435a842264a9be202587a..3d9cd1ac8673cc05077318993c7b09c67f08069f 100644 (file)
--- 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;