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net: annotate lockless accesses to sk->sk_max_ack_backlog

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[ Upstream commit 099ecf59f05b5f30f42ebac0ab8cb94f9b18c90c ]

sk->sk_max_ack_backlog can be read without any lock being held
at least in TCP/DCCP cases.

We need to use READ_ONCE()/WRITE_ONCE() to avoid load/store tearing
and/or potential KCSAN warnings.

Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Stable-dep-of: 4d5c70e6155d ("sctp: ensure sk_state is set to CLOSED if hashing fails in sctp_listen_start")
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Eric Dumazet 2019-11-05 14:11:54 -08:00 • committed by Greg Kroah-Hartman
commit ed494a6050
9 changed files with 10 additions and 10 deletions
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2
net/ipv4/af_inet.c
View file

@ -208,7 +208,7 @@ int inet_listen(struct socket *sock, int backlog)
if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
goto out;
sk->sk_max_ack_backlog = backlog;
WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
/* Really, if the socket is already in listen state
* we can only allow the backlog to be adjusted.
*/

2
net/ipv4/inet_connection_sock.c
View file

@ -767,7 +767,7 @@ static void reqsk_timer_handler(struct timer_list *t)
* ones are about to clog our table.
*/
qlen = reqsk_queue_len(queue);
if ((qlen << 1) > max(8U, sk_listener->sk_max_ack_backlog)) {
if ((qlen << 1) > max(8U, READ_ONCE(sk_listener->sk_max_ack_backlog))) {
int young = reqsk_queue_len_young(queue) << 1;
while (thresh > 2) {

2
net/ipv4/tcp.c
View file

@ -3281,7 +3281,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
* tcpi_sacked -> max backlog
*/
info->tcpi_unacked = READ_ONCE(sk->sk_ack_backlog);
info->tcpi_sacked = sk->sk_max_ack_backlog;
info->tcpi_sacked = READ_ONCE(sk->sk_max_ack_backlog);
return;
}

2
net/ipv4/tcp_diag.c
View file

@ -22,7 +22,7 @@ static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
if (inet_sk_state_load(sk) == TCP_LISTEN) {
r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
r->idiag_wqueue = sk->sk_max_ack_backlog;
r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog);
} else if (sk->sk_type == SOCK_STREAM) {
const struct tcp_sock *tp = tcp_sk(sk);