Commit 298e59d3 authored by Yonghong Song's avatar Yonghong Song Committed by Daniel Borkmann
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tools/bpf: fix bpftool map dump with bitfields

Commit 8772c8bc ("tools: bpftool: support pretty print
with kind_flag set") added bpftool map dump with kind_flag
support. When bitfield_size can be retrieved directly from
btf_member, function btf_dumper_bitfield() is called to
dump the bitfield. The implementation passed the
wrong parameter "bit_offset" to the function. The excepted
value is the bit_offset within a byte while the passed-in
value is the struct member offset.

This commit fixed the bug with passing correct "bit_offset"
with adjusted data pointer.

Fixes: 8772c8bc

 ("tools: bpftool: support pretty print with kind_flag set")
Acked-by: default avatarMartin KaFai Lau <>
Signed-off-by: default avatarYonghong Song <>
Signed-off-by: default avatarDaniel Borkmann <>
parent e43207fa
......@@ -82,8 +82,6 @@ static void btf_dumper_bitfield(__u32 nr_bits, __u8 bit_offset,
int bits_to_copy;
__u64 print_num;
data += BITS_ROUNDDOWN_BYTES(bit_offset);
bit_offset = BITS_PER_BYTE_MASKED(bit_offset);
bits_to_copy = bit_offset + nr_bits;
bytes_to_copy = BITS_ROUNDUP_BYTES(bits_to_copy);
......@@ -118,7 +116,9 @@ static void btf_dumper_int_bits(__u32 int_type, __u8 bit_offset,
* BTF_INT_OFFSET() cannot exceed 64 bits.
total_bits_offset = bit_offset + BTF_INT_OFFSET(int_type);
btf_dumper_bitfield(nr_bits, total_bits_offset, data, jw,
data += BITS_ROUNDDOWN_BYTES(total_bits_offset);
bit_offset = BITS_PER_BYTE_MASKED(total_bits_offset);
btf_dumper_bitfield(nr_bits, bit_offset, data, jw,
......@@ -216,11 +216,12 @@ static int btf_dumper_struct(const struct btf_dumper *d, __u32 type_id,
jsonw_name(d->jw, btf__name_by_offset(d->btf, m[i].name_off));
data_off = data + BITS_ROUNDDOWN_BYTES(bit_offset);
if (bitfield_size) {
btf_dumper_bitfield(bitfield_size, bit_offset,
data, d->jw, d->is_plain_text);
data_off, d->jw, d->is_plain_text);
} else {
data_off = data + BITS_ROUNDDOWN_BYTES(bit_offset);
ret = btf_dumper_do_type(d, m[i].type,
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