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    Subject[PATCH 5.10 10/65] tcp: Fix a data-race around sysctl_tcp_adv_win_scale.
    Date
    From: Kuniyuki Iwashima <kuniyu@amazon.com>

    commit 36eeee75ef0157e42fb6593dcc65daab289b559e upstream.

    While reading sysctl_tcp_adv_win_scale, it can be changed concurrently.
    Thus, we need to add READ_ONCE() to its reader.

    Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
    Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    include/net/tcp.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/include/net/tcp.h
    +++ b/include/net/tcp.h
    @@ -1396,7 +1396,7 @@ void tcp_select_initial_window(const str

    static inline int tcp_win_from_space(const struct sock *sk, int space)
    {
    - int tcp_adv_win_scale = sock_net(sk)->ipv4.sysctl_tcp_adv_win_scale;
    + int tcp_adv_win_scale = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_adv_win_scale);

    return tcp_adv_win_scale <= 0 ?
    (space>>(-tcp_adv_win_scale)) :

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