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-rw-r--r--Python/pystrtod.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/Python/pystrtod.c b/Python/pystrtod.c
index 3546d44c84..461e8dcb5e 100644
--- a/Python/pystrtod.c
+++ b/Python/pystrtod.c
@@ -391,6 +391,8 @@ _Py_string_to_number_with_underscores(
char *dup, *end;
PyObject *result;
+ assert(s[orig_len] == '\0');
+
if (strchr(s, '_') == NULL) {
return innerfunc(s, orig_len, arg);
}