diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-03-15 23:57:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-06-21 15:35:37 +0300 |
| commit | 4c64c3e2f5b6e4677b129065dedfc126d1a3730c (patch) | |
| tree | 072850fef400cda28798f31edbc38510199a2527 | |
| parent | f5c4276607c2da798b9b39345435f9cbab8f2afa (diff) | |
| download | linux-4c64c3e2f5b6e4677b129065dedfc126d1a3730c.tar.xz | |
af_unix: annotate lockless accesses to sk->sk_err
[ Upstream commit cc04410af7de348234ac36a5f50c4ce416efdb4b ]
unix_poll() and unix_dgram_poll() read sk->sk_err
without any lock held.
Add relevant READ_ONCE()/WRITE_ONCE() annotations.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 83690b82d228 ("af_unix: Use skb_queue_empty_lockless() in unix_release_sock().")
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/unix/af_unix.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 359d4f604ebd..02d8612385bd 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -548,7 +548,7 @@ 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); } } @@ -620,7 +620,7 @@ static void unix_release_sock(struct sock *sk, int embrion) /* No more writes */ WRITE_ONCE(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); @@ -3181,7 +3181,7 @@ static __poll_t unix_poll(struct file *file, struct socket *sock, poll_table *wa state = READ_ONCE(sk->sk_state); /* exceptional events? */ - if (sk->sk_err) + if (READ_ONCE(sk->sk_err)) mask |= EPOLLERR; if (shutdown == SHUTDOWN_MASK) mask |= EPOLLHUP; @@ -3228,7 +3228,8 @@ static __poll_t unix_dgram_poll(struct file *file, struct socket *sock, state = READ_ONCE(sk->sk_state); /* 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); |