bpf: add various test cases for alu op on mixed dst register types
Add couple of test_verifier tests to check sanitation of alu op insn with pointer and scalar type coming from different paths. This also includes BPF insns of the test reproducer provided by Jann Horn. Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net> Acked-by: NAlexei Starovoitov <ast@kernel.org> Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
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