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Helpers like bpf_prog_add(), bpf_prog_inc(), bpf_map_inc() can fail with an error, so make sure the caller properly checks their return value and not just ignores it, which could worst-case lead to use after free. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>