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

[Martin KaFai Lau]

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?