On Wed, Jun 20, 2018 at 1:07 AM, Ursula Braun <ubraun@xxxxxxxxxxxxx> wrote:
> diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
> index da7f02edcd37..21c84b924ffb 100644
> --- a/net/smc/af_smc.c
> +++ b/net/smc/af_smc.c
> @@ -605,6 +605,8 @@ static int smc_connect(struct socket *sock, struct sockaddr *addr,
>
> smc_copy_sock_settings_to_clc(smc);
> tcp_sk(smc->clcsock->sk)->syn_smc = 1;
> + if (flags & O_NONBLOCK)
> + sock->sk->sk_wq = smc->clcsock->sk->sk_wq;
> rc = kernel_connect(smc->clcsock, addr, alen, flags);
> if (rc)
> goto out;
> @@ -1285,12 +1287,9 @@ static __poll_t smc_poll_mask(struct socket *sock, __poll_t events)
>
> smc = smc_sk(sock->sk);
> sock_hold(sk);
> - lock_sock(sk);
> if ((sk->sk_state == SMC_INIT) || smc->use_fallback) {
> /* delegate to CLC child sock */
> - release_sock(sk);
> mask = smc->clcsock->ops->poll_mask(smc->clcsock, events);
> - lock_sock(sk);
> sk->sk_err = smc->clcsock->sk->sk_err;
> if (sk->sk_err) {
> mask |= EPOLLERR;
> @@ -1299,7 +1298,10 @@ static __poll_t smc_poll_mask(struct socket *sock, __poll_t events)
> if (sk->sk_state == SMC_INIT &&
> mask & EPOLLOUT &&
> smc->clcsock->sk->sk_state != TCP_CLOSE) {
> + sock->sk->sk_wq = smc->smcwq;
> + lock_sock(sk);
I think you need to use proper RCU API to protect these
assignment of sk->sk_wq.
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