Issue #27443: __length_hint__() of bytearray itearator no longer return

negative integer for resized bytearray.

1 files changed, 5 insertions, 1 deletions

diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index 277be59ad8..388e9909bd 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -3192,8 +3192,12 @@ static PyObject *
 bytearrayiter_length_hint(bytesiterobject *it)
 {
     Py_ssize_t len = 0;
-    if (it->it_seq)
+    if (it->it_seq) {
         len = PyByteArray_GET_SIZE(it->it_seq) - it->it_index;
+        if (len < 0) {
+            len = 0;
+        }
+    }
     return PyLong_FromSsize_t(len);
 }