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A map-of-maps lookup value is refined to a map pointer (map_ptr_or_null) at lookup time by refine_map_lookup_value(). Test that it is rejected wherever a raw map value would be read as bytes, so the inner map descriptor cannot leak. Signed-off-by: Amery Hung <ameryhung@gmail.com> Link: https://lore.kernel.org/bpf/20260801074633.1595644-8-ameryhung@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>