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tcp: Fix a data-race around sysctl_tcp_early_retrans.

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[ Upstream commit 52e65865deb6a36718a463030500f16530eaab74 ]

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

Fixes: eed530b6c6 ("tcp: early retransmit")
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
2022-07-18 10:26:45 -07:00
committed by Greg Kroah-Hartman
parent ffc388f6f0
commit 11e8b013d1
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_output.c
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@@ -2735,7 +2735,7 @@ bool tcp_schedule_loss_probe(struct sock *sk, bool advancing_rto)
if (rcu_access_pointer(tp->fastopen_rsk)) if (rcu_access_pointer(tp->fastopen_rsk))
return false; return false;
early_retrans = sock_net(sk)->ipv4.sysctl_tcp_early_retrans; early_retrans = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_early_retrans);
/* Schedule a loss probe in 2*RTT for SACK capable connections /* Schedule a loss probe in 2*RTT for SACK capable connections
* not in loss recovery, that are either limited by cwnd or application. * not in loss recovery, that are either limited by cwnd or application.
*/ */