py: Fix attrtuple array length in print and creation.

1 files changed, 4 insertions, 3 deletions

diff --git a/py/objattrtuple.c b/py/objattrtuple.c
index b3fa314489..04c17a2c64 100644
--- a/py/objattrtuple.c
+++ b/py/objattrtuple.c
@@ -34,7 +34,7 @@ STATIC
 #endif
 void mp_obj_attrtuple_print_helper(const mp_print_t *print, const qstr *fields, mp_obj_tuple_t *o) {
     mp_print_str(print, "(");
-    for (mp_uint_t i = 0; i < (o->len - 1); i++) {
+    for (mp_uint_t i = 0; i < o->len; i++) {
         if (i > 0) {
             mp_print_str(print, ", ");
         }
@@ -51,7 +51,7 @@ void mp_obj_attrtuple_print_helper(const mp_print_t *print, const qstr *fields,
 STATIC void mp_obj_attrtuple_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
     (void)kind;
     mp_obj_tuple_t *o = o_in;
-    const qstr *fields = (const qstr*)o->items[o->len - 1];
+    const qstr *fields = (const qstr*)o->items[o->len];
     mp_obj_attrtuple_print_helper(print, fields, o);
 }
 
@@ -71,8 +71,9 @@ STATIC void mp_obj_attrtuple_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
 }
 
 mp_obj_t mp_obj_new_attrtuple(const qstr *fields, mp_uint_t n, const mp_obj_t *items) {
-    mp_obj_tuple_t *o = mp_obj_new_tuple(n + 1, NULL);
+    mp_obj_tuple_t *o = m_new_obj_var(mp_obj_tuple_t, mp_obj_t, n + 1);
     o->base.type = &mp_type_attrtuple;
+    o->len = n;
     for (mp_uint_t i = 0; i < n; i++) {
         o->items[i] = items[i];
     }