path: root/net/ipv4/tcp_diag.c
diff options
authorEric Dumazet <edumazet@google.com>2015-11-12 08:43:18 -0800
committerDavid S. Miller <davem@davemloft.net>2015-11-15 18:36:38 -0500
commit00fd38d938db3f1ab1c486549afc450cb7e751b1 (patch)
tree484653a166b88da8777c900a01b2b8e0d5455147 /net/ipv4/tcp_diag.c
parentnet: thunder: Fix crash upon shutdown after failed probe (diff)
tcp: ensure proper barriers in lockless contexts
Some functions access TCP sockets without holding a lock and might output non consistent data, depending on compiler and or architecture. tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ... Introduce sk_state_load() and sk_state_store() to fix the issues, and more clearly document where this lack of locking is happening. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_diag.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 479f34946177..b31604086edd 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 (sk->sk_state == TCP_LISTEN) {
+ if (sk_state_load(sk) == TCP_LISTEN) {
r->idiag_rqueue = sk->sk_ack_backlog;
r->idiag_wqueue = sk->sk_max_ack_backlog;
} else if (sk->sk_type == SOCK_STREAM) {