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authorKuniyuki Iwashima <kuniyu@amazon.com>2022-07-18 10:26:48 -0700
committerDavid S. Miller <davem@davemloft.net>2022-07-20 10:14:50 +0100
commit4845b5713ab18a1bb6e31d1fbb4d600240b8b691 (patch)
tree3b1006f962476c31c415c8f357600aad22d32462 /include
parent7c6f2a86ca590d5187a073d987e9599985fb1c7c (diff)
tcp: Fix data-races around sysctl_tcp_slow_start_after_idle.
While reading sysctl_tcp_slow_start_after_idle, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. Fixes: 35089bb203f4 ("[TCP]: Add tcp_slow_start_after_idle sysctl.") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/tcp.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6ee1fb4fb292..071735e10872 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1403,8 +1403,8 @@ static inline void tcp_slow_start_after_idle_check(struct sock *sk)
struct tcp_sock *tp = tcp_sk(sk);
s32 delta;
- if (!sock_net(sk)->ipv4.sysctl_tcp_slow_start_after_idle || tp->packets_out ||
- ca_ops->cong_control)
+ if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_slow_start_after_idle) ||
+ tp->packets_out || ca_ops->cong_control)
return;
delta = tcp_jiffies32 - tp->lsndtime;
if (delta > inet_csk(sk)->icsk_rto)