tcp: Fix data-races around sysctl_tcp_workaround_signed_windows.

[platform/kernel/linux-starfive.git] / net / ipv4 / tcp_output.c

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index c38e07b..88f7d51 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -230,7 +230,7 @@ void tcp_select_initial_window(const struct sock *sk, int __space, __u32 mss,
         * which we interpret as a sign the remote TCP is not
         * misinterpreting the window field as a signed quantity.
         */
-       if (sock_net(sk)->ipv4.sysctl_tcp_workaround_signed_windows)
+       if (READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_workaround_signed_windows))
                (*rcv_wnd) = min(space, MAX_TCP_WINDOW);
        else
                (*rcv_wnd) = min_t(u32, space, U16_MAX);
@@ -285,7 +285,7 @@ static u16 tcp_select_window(struct sock *sk)
         * scaled window.
         */
        if (!tp->rx_opt.rcv_wscale &&
-           sock_net(sk)->ipv4.sysctl_tcp_workaround_signed_windows)
+           READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_workaround_signed_windows))
                new_win = min(new_win, MAX_TCP_WINDOW);
        else
                new_win = min(new_win, (65535U << tp->rx_opt.rcv_wscale));