6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit 251cd405a9e6e70b92fe5afbdd17fd5caf9d3266 ]
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@xxxxxxxxxx>
Cc: Yangbo Lu <yangbo.lu@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/core/sock.c | 4 ++--
net/socket.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/net/core/sock.c b/net/core/sock.c
index fea5961c51fd1..0a687c8fbed7f 100644
--- 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;
}
@@ -1719,7 +1719,7 @@ 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 6bba7818b593d..b5639a6500158 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -935,7 +935,7 @@ 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;
--
2.40.1
