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The test added in this patch exercises the logic fixed in the previous patch in this series. Before the previous patch's changes, bpf_refcount_acquire accepts MAYBE_NULL local kptrs; after the change the verifier correctly rejects the such a call. Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com> Link: https://lore.kernel.org/r/20231107085639.3016113-3-davemarchevsky@fb.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>