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authorEric Dumazet <edumazet@google.com>2019-11-06 01:11:53 +0300
committerDavid S. Miller <davem@davemloft.net>2019-11-07 03:14:48 +0300
commit288efe8606b62d0753ba6722b36ef241877251fd (patch)
tree37cbacf02e504fafe20062ae25909a4ecfc4c807
parent7976a11b30929871a4c84c3c406d7681a3dbcc10 (diff)
downloadlinux-288efe8606b62d0753ba6722b36ef241877251fd.tar.xz
net: annotate lockless accesses to sk->sk_ack_backlog
sk->sk_ack_backlog can be read without any lock being held. 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>
-rw-r--r--include/net/sock.h6
-rw-r--r--net/ipv4/tcp.c2
-rw-r--r--net/ipv4/tcp_diag.c2
-rw-r--r--net/ipv4/tcp_ipv4.c2
-rw-r--r--net/ipv6/tcp_ipv6.c2
-rw-r--r--net/sched/em_meta.c2
-rw-r--r--net/sctp/diag.c2
7 files changed, 9 insertions, 9 deletions
diff --git a/include/net/sock.h b/include/net/sock.h
index f2f853439b65..a126784aa7d9 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -859,17 +859,17 @@ static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask)
static inline void sk_acceptq_removed(struct sock *sk)
{
- sk->sk_ack_backlog--;
+ WRITE_ONCE(sk->sk_ack_backlog, sk->sk_ack_backlog - 1);
}
static inline void sk_acceptq_added(struct sock *sk)
{
- sk->sk_ack_backlog++;
+ WRITE_ONCE(sk->sk_ack_backlog, sk->sk_ack_backlog + 1);
}
static inline bool sk_acceptq_is_full(const struct sock *sk)
{
- return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
+ return READ_ONCE(sk->sk_ack_backlog) > sk->sk_max_ack_backlog;
}
/*
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 1dd25189d83f..68375f7ffdce 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3225,7 +3225,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
* tcpi_unacked -> Number of children ready for accept()
* tcpi_sacked -> max backlog
*/
- info->tcpi_unacked = sk->sk_ack_backlog;
+ info->tcpi_unacked = READ_ONCE(sk->sk_ack_backlog);
info->tcpi_sacked = sk->sk_max_ack_backlog;
return;
}
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 549506162dde..edfbab54c46f 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -21,7 +21,7 @@ static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
struct tcp_info *info = _info;
if (inet_sk_state_load(sk) == TCP_LISTEN) {
- r->idiag_rqueue = sk->sk_ack_backlog;
+ r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
r->idiag_wqueue = sk->sk_max_ack_backlog;
} else if (sk->sk_type == SOCK_STREAM) {
const struct tcp_sock *tp = tcp_sk(sk);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 899e100a68e6..92282f98dc82 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2451,7 +2451,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i)
state = inet_sk_state_load(sk);
if (state == TCP_LISTEN)
- rx_queue = sk->sk_ack_backlog;
+ rx_queue = READ_ONCE(sk->sk_ack_backlog);
else
/* Because we don't lock the socket,
* we might find a transient negative value.
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 4804b6dc5e65..81f51335e326 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1891,7 +1891,7 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
state = inet_sk_state_load(sp);
if (state == TCP_LISTEN)
- rx_queue = sp->sk_ack_backlog;
+ rx_queue = READ_ONCE(sp->sk_ack_backlog);
else
/* Because we don't lock the socket,
* we might find a transient negative value.
diff --git a/net/sched/em_meta.c b/net/sched/em_meta.c
index 3177dcb17316..ebb6e2430861 100644
--- a/net/sched/em_meta.c
+++ b/net/sched/em_meta.c
@@ -521,7 +521,7 @@ META_COLLECTOR(int_sk_ack_bl)
*err = -1;
return;
}
- dst->value = sk->sk_ack_backlog;
+ dst->value = READ_ONCE(sk->sk_ack_backlog);
}
META_COLLECTOR(int_sk_max_ack_bl)
diff --git a/net/sctp/diag.c b/net/sctp/diag.c
index 0851166b9175..f873f15407de 100644
--- a/net/sctp/diag.c
+++ b/net/sctp/diag.c
@@ -425,7 +425,7 @@ static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
r->idiag_wqueue = infox->asoc->sndbuf_used;
} else {
- r->idiag_rqueue = sk->sk_ack_backlog;
+ r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
r->idiag_wqueue = sk->sk_max_ack_backlog;
}
if (infox->sctpinfo)