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The bpf_get_stackid() function may also return 0 on success as per UAPI BPF helper documentation. Therefore, correct checks from 'val > 0' to 'val >= 0' to ensure that they cover all possible success return values. Signed-off-by: Yuntao Wang <ytcoode@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20220408041452.933944-1-ytcoode@gmail.com