The BTF enum value is stored in a signed 32-bit field even when the enum is unsigned. Passing it directly to jsonw_uint_field(), which takes a uint64_t, sign-extends values with bit 31 set. For example, 0xffffffffU is printed as 18446744073709551615 instead of 4294967295 by bpftool -j btf dump. Cast the value to __u32 before widening it, matching the conversion already used for plain-text output. Fixes: c93cc69004df ("bpftool: add ability to dump BTF types") Signed-off-by: Hungyu Lin --- tools/bpf/bpftool/btf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c index abd661db91e6..385521e6b028 100644 --- a/tools/bpf/bpftool/btf.c +++ b/tools/bpf/bpftool/btf.c @@ -482,7 +482,7 @@ static int dump_btf_type(const struct btf *btf, __u32 id, if (btf_kflag(t)) jsonw_int_field(w, "val", v->val); else - jsonw_uint_field(w, "val", v->val); + jsonw_uint_field(w, "val", (__u32)v->val); jsonw_end_object(w); } else { if (btf_kflag(t)) base-commit: 7101b10cf281f629ac58c99697ca6f6d082b99a7 -- 2.43.0