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`argv` may be modified when `mrb_funcall()` is called; fix #3419

Calling `mrb_funcall()` and `mrb_yield()` (and their related
functions) are discouraged unless absolutely necessary, because
it can cause this kind of issues very easily.
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matz committed Feb 4, 2017
1 parent 8f52b88 commit bf4e79cc62af809138bc7db7e54ece67080b5fa8
Showing with 3 additions and 0 deletions.
  1. +3 −0 src/kernel.c
@@ -445,8 +445,11 @@ mrb_obj_extend_m(mrb_state *mrb, mrb_value self)
mrb_value *argv;
mrb_int argc;
mrb_value args;
mrb_get_args(mrb, "*", &argv, &argc);
args = mrb_ary_new_from_values(mrb, argc, argv);
argv = (mrb_value*)RARRAY_PTR(args);
return mrb_obj_extend(mrb, argc, argv, self);

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