dearblue 8441eaf633 Fixed "Out-of-bounds Read" and "Divide-by-Zero" in ary_product_group() ...

Reproduction:

  - Out-of-bounds Read

    ```console
    % build/host/bin/mruby -e '([nil] * 256).__product_group([[nil] * 256], 1 << 32, 256)'
    zsh: segmentation fault (core dumped)  build/host/bin/mruby -e
    ```

  - Divide-by-Zero

    ```console
    % build/host/bin/mruby -e '([nil] * 256).__product_group([[]], 1 << 32, 256)'
    zsh: floating point exception (core dumped)  build/host/bin/mruby -e '([nil] * 256).__product_group([[]], 1 << 32, 256)'
    ```

2026-03-19 23:11:06 +09:00

..

array.c

Fixed "Out-of-bounds Read" and "Divide-by-Zero" in ary_product_group()

2026-03-19 23:11:06 +09:00