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libbpf: Fix signedness bug in btf_dump_array_data()

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The btf__resolve_size() function returns negative error codes so
"elem_size" must be signed for the error handling to work.

Fixes: 920d16af9b ("libbpf: BTF dumper support for typed data")
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/bpf/20220208071552.GB10495@kili
This commit is contained in:
Dan Carpenter authored and Daniel Borkmann committed 2022-02-08 22:34:44 +01:00
1 parent 5912fcb4be
commit 4172843ed4
1 file changed
+3 -2
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tools/lib/bpf/btf_dump.c
+3 -2
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@@ -1861,14 +1861,15 @@ static int btf_dump_array_data(struct btf_dump *d,
{
const struct btf_array *array = btf_array(t);
const struct btf_type *elem_type;
__u32 i, elem_size = 0, elem_type_id;
__u32 i, elem_type_id;
__s64 elem_size;
bool is_array_member;
elem_type_id = array->type;
elem_type = skip_mods_and_typedefs(d->btf, elem_type_id, NULL);
elem_size = btf__resolve_size(d->btf, elem_type_id);
if (elem_size <= 0) {
pr_warn("unexpected elem size %d for array type [%u]\n", elem_size, id);
pr_warn("unexpected elem size %lld for array type [%u]\n", elem_size, id);
return -EINVAL;
}