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authorEric Dumazet <edumazet@google.com>2019-11-05 14:11:54 -0800
committerDavid S. Miller <davem@davemloft.net>2019-11-06 16:14:48 -0800
commit099ecf59f05b5f30f42ebac0ab8cb94f9b18c90c (patch)
tree06d62b7b24635bbb78ad38f24933cad260b5c346 /net/ipv4
parentnet: annotate lockless accesses to sk->sk_ack_backlog (diff)
downloadlinux-dev-099ecf59f05b5f30f42ebac0ab8cb94f9b18c90c.tar.xz
linux-dev-099ecf59f05b5f30f42ebac0ab8cb94f9b18c90c.zip
net: annotate lockless accesses to sk->sk_max_ack_backlog
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 <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/af_inet.c2
-rw-r--r--net/ipv4/inet_connection_sock.c2
-rw-r--r--net/ipv4/tcp.c2
-rw-r--r--net/ipv4/tcp_diag.c2
4 files changed, 4 insertions, 4 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 70f92aaca411..53de8e00990e 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -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.
*/
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index eb30fc1770de..e4c6e8b40490 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -716,7 +716,7 @@ 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) {
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 68375f7ffdce..fb1666440e10 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3226,7 +3226,7 @@ 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;
}
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index edfbab54c46f..0d08f9e2d8d0 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -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);