method_missing() may have CALL_MAXARGS-1 arguments; fix #3351

The issue was reported by https://hackerone.com/ston3

1 files changed, 3 insertions, 0 deletions

diff --git a/src/vm.c b/src/vm.c
index 1ea23afc7..cca0fd03b 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1143,6 +1143,9 @@ RETRY_TRY_BLOCK:
         else {
           value_move(regs+a+2, regs+a+1, ++n);
           regs[a+1] = sym;
+          if (n == CALL_MAXARGS) {
+            regs[a+1] = mrb_ary_new_from_values(mrb, n, regs+a+1);
+          }
         }
       }