net: prevent load/store tearing on sk->sk_stamp

Add a couple of READ_ONCE() and WRITE_ONCE() to prevent
load-tearing and store-tearing in sock_read_timestamp()
and sock_write_timestamp()

This might prevent another KCSAN report.

Fixes: 3a0ed3e96197 ("sock: Make sock->sk_stamp thread-safe")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Deepa Dinamani <deepa.kernel@gmail.com>
Acked-by: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
index 8f9adcfac41b..718e62fbe869 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2342,7 +2342,7 @@ static inline ktime_t sock_read_timestamp(struct sock *sk)
 
         return kt;
 #else
-        return sk->sk_stamp;
+        return READ_ONCE(sk->sk_stamp);
 #endif
 }
 
@@ -2353,7 +2353,7 @@ static inline void sock_write_timestamp(struct sock *sk, ktime_t kt)
         sk->sk_stamp = kt;
         write_sequnlock(&sk->sk_stamp_seq);
 #else
-        sk->sk_stamp = kt;
+        WRITE_ONCE(sk->sk_stamp, kt);
 #endif
 }