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libbpf: Fix handling of optional field_name in btf_dump__emit_type_decl
Internal functions, used by btf_dump__emit_type_decl(), assume field_name is
never going to be NULL. Ensure it's always the case.
Fixes: 9f81654eeb
("libbpf: Expose BTF-to-C type declaration emitting API")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200303180800.3303471-1-andriin@fb.com
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@ -1030,7 +1030,7 @@ int btf_dump__emit_type_decl(struct btf_dump *d, __u32 id,
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if (!OPTS_VALID(opts, btf_dump_emit_type_decl_opts))
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return -EINVAL;
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fname = OPTS_GET(opts, field_name, NULL);
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fname = OPTS_GET(opts, field_name, "");
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lvl = OPTS_GET(opts, indent_level, 0);
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btf_dump_emit_type_decl(d, id, fname, lvl);
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return 0;
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