Closing DEFAULT or NEXT can crash Ruby #207

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1. kou commented on Jul 18, 2026

   

   kou

   on Jul 18, 2026

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   Users should not do it.

   If we accept it, the following code will work:

   diff --git a/ext/fiddle/handle.c b/ext/fiddle/handle.c
   index 0d03133..34f35e4 100644
   --- a/ext/fiddle/handle.c
   +++ b/ext/fiddle/handle.c
   @@ -72,6 +72,8 @@ rb_fiddle_handle_close(VALUE self)
    {
        struct dl_handle *fiddle_handle;
    
   +    rb_check_frozen(self);
   +
        TypedData_Get_Struct(self, struct dl_handle, &fiddle_handle_data_type, fiddle_handle);
        if(fiddle_handle->open) {
    	int ret = dlclose(fiddle_handle->ptr);