Commit cc04410a authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller

af_unix: annotate lockless accesses to sk->sk_err

unix_poll() and unix_dgram_poll() read sk->sk_err
without any lock held.

Add relevant READ_ONCE()/WRITE_ONCE() annotations.
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9ae8e5ad
......@@ -557,7 +557,7 @@ static void unix_dgram_disconnected(struct sock *sk, struct sock *other)
* when peer was not connected to us.
*/
if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) {
other->sk_err = ECONNRESET;
WRITE_ONCE(other->sk_err, ECONNRESET);
sk_error_report(other);
}
}
......@@ -630,7 +630,7 @@ static void unix_release_sock(struct sock *sk, int embrion)
/* No more writes */
skpair->sk_shutdown = SHUTDOWN_MASK;
if (!skb_queue_empty(&sk->sk_receive_queue) || embrion)
skpair->sk_err = ECONNRESET;
WRITE_ONCE(skpair->sk_err, ECONNRESET);
unix_state_unlock(skpair);
skpair->sk_state_change(skpair);
sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP);
......@@ -3165,7 +3165,7 @@ static __poll_t unix_poll(struct file *file, struct socket *sock, poll_table *wa
mask = 0;
/* exceptional events? */
if (sk->sk_err)
if (READ_ONCE(sk->sk_err))
mask |= EPOLLERR;
if (sk->sk_shutdown == SHUTDOWN_MASK)
mask |= EPOLLHUP;
......@@ -3208,7 +3208,8 @@ static __poll_t unix_dgram_poll(struct file *file, struct socket *sock,
mask = 0;
/* exceptional events? */
if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
if (READ_ONCE(sk->sk_err) ||
!skb_queue_empty_lockless(&sk->sk_error_queue))
mask |= EPOLLERR |
(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
......
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