net: annotate data-races around sk->sk_bind_phc

sk->sk_bind_phc is read locklessly. Add corresponding annotations.

Fixes: d463126e23f1 ("net: sock: extend SO_TIMESTAMPING for PHC binding")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/sock.c b/net/core/sock.c
index d05a290..d3c7b53 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -894,7 +894,7 @@ static int sock_timestamping_bind_phc(struct sock *sk, int phc_index)
        if (!match)
                return -EINVAL;
 
-       sk->sk_bind_phc = phc_index;
+       WRITE_ONCE(sk->sk_bind_phc, phc_index);
 
        return 0;
 }
@@ -1720,7 +1720,7 @@ int sk_getsockopt(struct sock *sk, int level, int optname,
        case SO_TIMESTAMPING_OLD:
                lv = sizeof(v.timestamping);
                v.timestamping.flags = READ_ONCE(sk->sk_tsflags);
-               v.timestamping.bind_phc = sk->sk_bind_phc;
+               v.timestamping.bind_phc = READ_ONCE(sk->sk_bind_phc);
                break;
 
        case SO_RCVTIMEO_OLD:

diff --git a/net/socket.c b/net/socket.c
index 98ffffa..928b058 100644 (file)
--- a/net/socket.c
+++ b/net/socket.c
@@ -939,7 +939,7 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
 
                if (tsflags & SOF_TIMESTAMPING_BIND_PHC)
                        hwtstamp = ptp_convert_timestamp(&hwtstamp,
-                                                        sk->sk_bind_phc);
+                                                        READ_ONCE(sk->sk_bind_phc));
 
                if (ktime_to_timespec64_cond(hwtstamp, tss.ts + 2)) {
                        empty = 0;