libbpf: Add NULL check to add_dummy_ksym_var
Avoids a segv if btf isn't present. Seen on the call path __bpf_object__open calling bpf_object__collect_externs. Fixes: 5bd022ec01f0 (libbpf: Support extern kernel function) Suggested-by: Stanislav Fomichev <sdf@google.com> Suggested-by: Petar Penkov <ppenkov@google.com> Signed-off-by: Ian Rogers <irogers@google.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210504234910.976501-1-irogers@google.com
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@ -3216,6 +3216,9 @@ static int add_dummy_ksym_var(struct btf *btf)
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const struct btf_var_secinfo *vs;
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const struct btf_type *sec;
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if (!btf)
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return 0;
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sec_btf_id = btf__find_by_name_kind(btf, KSYMS_SEC,
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BTF_KIND_DATASEC);
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if (sec_btf_id < 0)
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