tcp: Fix data-races around sysctl_tcp_base_mss.
While reading sysctl_tcp_base_mss, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its readers.
Fixes: 5d424d5a67
("[TCP]: MTU probing")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Родитель
f47d00e077
Коммит
88d78bc097
|
@ -1765,7 +1765,7 @@ void tcp_mtup_init(struct sock *sk)
|
|||
icsk->icsk_mtup.enabled = READ_ONCE(net->ipv4.sysctl_tcp_mtu_probing) > 1;
|
||||
icsk->icsk_mtup.search_high = tp->rx_opt.mss_clamp + sizeof(struct tcphdr) +
|
||||
icsk->icsk_af_ops->net_header_len;
|
||||
icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, net->ipv4.sysctl_tcp_base_mss);
|
||||
icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, READ_ONCE(net->ipv4.sysctl_tcp_base_mss));
|
||||
icsk->icsk_mtup.probe_size = 0;
|
||||
if (icsk->icsk_mtup.enabled)
|
||||
icsk->icsk_mtup.probe_timestamp = tcp_jiffies32;
|
||||
|
|
|
@ -171,7 +171,7 @@ static void tcp_mtu_probing(struct inet_connection_sock *icsk, struct sock *sk)
|
|||
icsk->icsk_mtup.probe_timestamp = tcp_jiffies32;
|
||||
} else {
|
||||
mss = tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low) >> 1;
|
||||
mss = min(net->ipv4.sysctl_tcp_base_mss, mss);
|
||||
mss = min(READ_ONCE(net->ipv4.sysctl_tcp_base_mss), mss);
|
||||
mss = max(mss, net->ipv4.sysctl_tcp_mtu_probe_floor);
|
||||
mss = max(mss, net->ipv4.sysctl_tcp_min_snd_mss);
|
||||
icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);
|
||||
|
|
Загрузка…
Ссылка в новой задаче