| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 06/34] tcp: Fix a data-race around sysctl_tcp_adv_win_scale. | Date | Mon, 1 Aug 2022 13:46:46 +0200 |
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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 @@ -1389,7 +1389,7 @@ 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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