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068d9d1eba
Enforce XDP_FLAGS_UPDATE_IF_NOEXIST only if new BPF program to be attached is non-NULL (i.e., we are not detaching a BPF program). Fixes: d4baa9368a5e ("bpf, xdp: Extract common XDP program attachment logic") Reported-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Tested-by: Stanislav Fomichev <sdf@google.com> Acked-by: Toke Høiland-Jørgensen <toke@redhat.com> Link: https://lore.kernel.org/bpf/20200812022923.1217922-1-andriin@fb.com