bpf: harden sockmap program attach to ensure correct map type
When attaching a program to sockmap we need to check map type is correct. Fixes: 174a79ff ("bpf: sockmap with sk redirect support") Signed-off-by: NJohn Fastabend <john.fastabend@gmail.com> Acked-by: NAlexei Starovoitov <ast@kernel.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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