Fix heap use after free on mruby-aws-sigv4.
@@ -527,6 +527,8 @@ mrb_exec_irep(mrb_state *mrb, mrb_value self, struct RProc *p)
return MRB_PROC_CFUNC(p)(mrb, self);
}
ci->nregs = p->body.irep->nregs;
+ ci->env = MRB_PROC_ENV(p);
+ if (ci->env) ci->env->stack[0] = self;
if (ci->argc < 0) keep = 3;
else keep = ci->argc + 2;
if (ci->nregs < keep) {
