diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-15 10:17:55 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-07-18 12:21:54 +0100 |
| commit | 021266ec640c7a4527e6cd4b7349a512b351de1d (patch) | |
| tree | 1eb5186ef049d12e569d65fccf1657065dfc618c /net/ipv4 | |
| parent | 5a54213318c43f4009ae158347aa6016e3b9b55a (diff) | |
| download | linux-021266ec640c7a4527e6cd4b7349a512b351de1d.tar.gz linux-021266ec640c7a4527e6cd4b7349a512b351de1d.tar.bz2 linux-021266ec640c7a4527e6cd4b7349a512b351de1d.zip | |
tcp: Fix data-races around sysctl_tcp_fastopen_blackhole_timeout.
While reading sysctl_tcp_fastopen_blackhole_timeout, it can be changed
concurrently. Thus, we need to add READ_ONCE() to its readers.
Fixes: cf1ef3f0719b ("net/tcp_fastopen: Disable active side TFO in certain scenarios")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_fastopen.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c index 0acdb5473850..825b216d11f5 100644 --- a/net/ipv4/tcp_fastopen.c +++ b/net/ipv4/tcp_fastopen.c @@ -489,7 +489,7 @@ void tcp_fastopen_active_disable(struct sock *sk) { struct net *net = sock_net(sk); - if (!sock_net(sk)->ipv4.sysctl_tcp_fastopen_blackhole_timeout) + if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen_blackhole_timeout)) return; /* Paired with READ_ONCE() in tcp_fastopen_active_should_disable() */ @@ -510,7 +510,8 @@ void tcp_fastopen_active_disable(struct sock *sk) */ bool tcp_fastopen_active_should_disable(struct sock *sk) { - unsigned int tfo_bh_timeout = sock_net(sk)->ipv4.sysctl_tcp_fastopen_blackhole_timeout; + unsigned int tfo_bh_timeout = + READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen_blackhole_timeout); unsigned long timeout; int tfo_da_times; int multiplier; |