diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-22 21:22:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-03 13:00:48 +0300 |
| commit | 48323978912754eb589edd2dfd4fb5f5140a2cdd (patch) | |
| tree | ae830994c9e6c20503e6912df14806bd52f78deb /net | |
| parent | 530a4da37ece1dd071eeb2e93fb353c56254e407 (diff) | |
| download | linux-48323978912754eb589edd2dfd4fb5f5140a2cdd.tar.xz | |
tcp: Fix a data-race around sysctl_tcp_comp_sack_delay_ns.
[ Upstream commit 4866b2b0f7672b6d760c4b8ece6fb56f965dcc8a ]
While reading sysctl_tcp_comp_sack_delay_ns, it can be changed
concurrently. Thus, we need to add READ_ONCE() to its reader.
Fixes: 6d82aa242092 ("tcp: add tcp_comp_sack_delay_ns sysctl")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_input.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 716bc95ebfb0..b86d98c07cdf 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -5461,7 +5461,8 @@ send_now: if (tp->srtt_us && tp->srtt_us < rtt) rtt = tp->srtt_us; - delay = min_t(unsigned long, sock_net(sk)->ipv4.sysctl_tcp_comp_sack_delay_ns, + delay = min_t(unsigned long, + READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_comp_sack_delay_ns), rtt * (NSEC_PER_USEC >> 3)/20); sock_hold(sk); hrtimer_start_range_ns(&tp->compressed_ack_timer, ns_to_ktime(delay), |