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tcp: Fix a data-race around sysctl_tcp_comp_sack_slack_ns.

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[ Upstream commit 22396941a7 ]

While reading sysctl_tcp_comp_sack_slack_ns, it can be changed
concurrently.  Thus, we need to add READ_ONCE() to its reader.

Fixes: a70437cc09 ("tcp: add hrtimer slack to sack compression")
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>
This commit is contained in:
Kuniyuki Iwashima 2022-07-22 11:22:02 -07:00 committed by Greg Kroah-Hartman
parent 4832397891
commit d2476f2059
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_input.c
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@ -5466,7 +5466,7 @@ static void __tcp_ack_snd_check(struct sock *sk, int ofo_possible)
rtt * (NSEC_PER_USEC >> 3)/20);
sock_hold(sk);
hrtimer_start_range_ns(&tp->compressed_ack_timer, ns_to_ktime(delay),
sock_net(sk)->ipv4.sysctl_tcp_comp_sack_slack_ns,
READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_comp_sack_slack_ns),
HRTIMER_MODE_REL_PINNED_SOFT);
}