PyUnicode_FindChar() raises a IndexError on invalid index

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index c0511ddc192c75fc2ac20d9a9eb410bc6030fef3..ab77b03ca68c050fb7c74d887e5f40fa602d1826 100644 (file)
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -8089,6 +8089,10 @@ PyUnicode_FindChar(PyObject *str, Py_UCS4 ch,
     int kind;
     if (PyUnicode_READY(str) == -1)
         return -2;
+    if (start < 0 || end < 0) {
+        PyErr_SetString(PyExc_IndexError, "string index out of range");
+        return -2;
+    }
     if (end > PyUnicode_GET_LENGTH(str))
         end = PyUnicode_GET_LENGTH(str);
     kind = PyUnicode_KIND(str);