In the Linux kernel, the following vulnerability has been resolved:
tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key().
lockdep_sock_is_held() was added in tcp_ao_established_key()
by the cited commit.
It can be called from tcp_v[46]_timewait_ack() with twsk.
Since it does not have sk->sk_lock, the lockdep annotation
results in out-of-bound access.
$ pahole -C tcp_timewait_sock vmlinux | grep size
/ size: 288, cachelines: 5, members: 8 /
$ pahole -C sock vmlinux | grep sk_lock
socket_lock_t sk_lock; / 440 192 /
Let's not use lockdep_sock_is_held() for TCP_TIME_WAIT.