[issue40958] ASAN/UBSAN: heap-buffer-overflow in pegen.c

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

You can get an assert failure without ASAN with this patch:

diff --git a/Parser/pegen.c b/Parser/pegen.c
index e29910bf86..65fa44921f 100644
--- a/Parser/pegen.c
+++ b/Parser/pegen.c
@@ -145,6 +145,9 @@ byte_offset_to_character_offset(PyObject *line, int 
col_offset)
     if (!str) {
         return 0;
     }
+    assert(col_offset <= PyUnicode_GET_LENGTH(line) + 1);
     PyObject *text = PyUnicode_DecodeUTF8(str, col_offset, "replace");
     if (!text) {
         return 0;

----------

_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40958>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe: 
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com