diff options
Diffstat (limited to 'kernel/bpf/btf.c')
| -rw-r--r-- | kernel/bpf/btf.c | 21 |
1 files changed, 2 insertions, 19 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 14889fd5ba8e..027f9f8a3551 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -3805,25 +3805,8 @@ struct btf_record *btf_parse_fields(const struct btf *btf, const struct btf_type goto end; } - /* need collection identity for non-owning refs before allowing this - * - * Consider a node type w/ both list and rb_node fields: - * struct node { - * struct bpf_list_node l; - * struct bpf_rb_node r; - * } - * - * Used like so: - * struct node *n = bpf_obj_new(....); - * bpf_list_push_front(&list_head, &n->l); - * bpf_rbtree_remove(&rb_root, &n->r); - * - * It should not be possible to rbtree_remove the node since it hasn't - * been added to a tree. But push_front converts n to a non-owning - * reference, and rbtree_remove accepts the non-owning reference to - * a type w/ bpf_rb_node field. - */ - if (btf_record_has_field(rec, BPF_LIST_NODE) && + if (rec->refcount_off < 0 && + btf_record_has_field(rec, BPF_LIST_NODE) && btf_record_has_field(rec, BPF_RB_NODE)) { ret = -EINVAL; goto end; |