Subject: Re: [PATCH net 1/7] can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939_FILTER)

From: Jakub Kicinski <[email-masked]>
Date: Thu, 5 Oct 2023 09:44:21 -0700

On Thu,  5 Oct 2023 11:46:33 +0200 Marc Kleine-Budde wrote:
> Lock jsk->sk to prevent UAF when setsockopt(..., SO_J1939_FILTER, ...)
> modifies jsk->filters while receiving packets.

Doesn't it potentially introduce sleep in atomic?

j1939_sk_recv_match()
  spin_lock_bh(&priv->j1939_socks_lock);
  j1939_sk_recv_match_one()
    j1939_sk_match_filter()
      lock_sock()
        sleep