Re: [PATCH bpf-next v1 1/3] bpf, sockmap: avoid using sk_socket after free

On 2/26/25 5:22 AM, Jiayuan Chen wrote:

Use RCU lock to protect sk_socket, preventing concurrent close and release by another thread.

Because TCP/UDP are already within a relatively large critical section: ''' ip_local_deliver_finish rcu_read_lock ip_protocol_deliver_rcu tcp_rcv/udp_rcv rcu_read_unlock '''

Adding rcu_read_{un}lock() at the entrance and exit of sk_data_ready will not increase performance overhead.

Can it use a Fixes tag?