Re: [PATCH bpf] bpf, sockmap: take the socket lock in udp_bpf_recvmsg()

[Cong Wang]

On Wed, Jun 10, 2026 at 05:59:17PM +0000, Sechang Lim wrote:
> diff --git a/net/ipv4/udp_bpf.c b/net/ipv4/udp_bpf.c
> index 9f33b07b1481..8dd73e9ee1ea 100644
> --- a/net/ipv4/udp_bpf.c
> +++ b/net/ipv4/udp_bpf.c
> @@ -80,7 +80,9 @@ static int udp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
>  	}
>  
>  msg_bytes_ready:
> +	lock_sock(sk);
>  	copied = sk_msg_recvmsg(sk, psock, msg, len, flags);
> +	release_sock(sk);
>  	if (!copied) {
>  		long timeo;
>  		int data;

It seems Kuniyuki's fix covers more than yours:
https://lore.kernel.org/bpf/20260221233234.3814768-4-kuniyu@xxxxxxxxxx/

Regards,
Cong