net: add missing data-race annotations around sk->sk_peek_off

sk_getsockopt() runs locklessly, thus we need to annotate the read
of sk->sk_peek_off.

While we are at it, add corresponding annotations to sk_set_peek_off()
and unix_set_peek_off().

Fixes: b9bb53f3836f ("sock: convert sk_peek_offset functions to WRITE_ONCE")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/sock.c b/net/core/sock.c
index d831a3d..d57acae 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1870,7 +1870,7 @@ int sk_getsockopt(struct sock *sk, int level, int optname,
                if (!sock->ops->set_peek_off)
                        return -EOPNOTSUPP;
 
-               v.val = sk->sk_peek_off;
+               v.val = READ_ONCE(sk->sk_peek_off);
                break;
        case SO_NOFCS:
                v.val = sock_flag(sk, SOCK_NOFCS);
@@ -3179,7 +3179,7 @@ EXPORT_SYMBOL(__sk_mem_reclaim);
 
 int sk_set_peek_off(struct sock *sk, int val)
 {
-       sk->sk_peek_off = val;
+       WRITE_ONCE(sk->sk_peek_off, val);
        return 0;
 }
 EXPORT_SYMBOL_GPL(sk_set_peek_off);

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 7858521..86930a8 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -790,7 +790,7 @@ static int unix_set_peek_off(struct sock *sk, int val)
        if (mutex_lock_interruptible(&u->iolock))
                return -EINTR;
 
-       sk->sk_peek_off = val;
+       WRITE_ONCE(sk->sk_peek_off, val);
        mutex_unlock(&u->iolock);
 
        return 0;