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tcp: Fix a data-race around sysctl_tcp_adv_win_scale.

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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: 1da177e4c3 ("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>
This commit is contained in:
Kuniyuki Iwashima
2022-07-20 09:50:14 -07:00
committed by Greg Kroah-Hartman
parent 3cddb7a7a5
commit 312ce3901f
1 changed files with 1 additions and 1 deletions
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2
include/net/tcp.h
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@@ -1396,7 +1396,7 @@ void tcp_select_initial_window(const struct sock *sk, int __space,
static inline int tcp_win_from_space(const struct sock *sk, int space) 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 ? return tcp_adv_win_scale <= 0 ?
(space>>(-tcp_adv_win_scale)) : (space>>(-tcp_adv_win_scale)) :