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With trusted args now being the default, passing NULL to kfunc parameters that are pointers causes verifier rejection rather than a runtime error. The test_bpf_nf test was failing because it attempted to pass NULL to bpf_xdp_ct_lookup() to verify runtime error handling. Since the NULL check now happens at verification time, remove the runtime test case that passed NULL to the bpf_tuple parameter and instead add verification-time tests to ensure the verifier correctly rejects programs that pass NULL to trusted arguments. Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Link: https://lore.kernel.org/r/20260102180038.2708325-11-puranjay@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>