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tcp: Fix a data-race around sysctl_tcp_probe_interval.
While reading sysctl_tcp_probe_interval, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: 05cbc0db03
("ipv4: Create probe timer for tcp PMTU as per RFC4821")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -2283,7 +2283,7 @@ static inline void tcp_mtu_check_reprobe(struct sock *sk)
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u32 interval;
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s32 delta;
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interval = net->ipv4.sysctl_tcp_probe_interval;
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interval = READ_ONCE(net->ipv4.sysctl_tcp_probe_interval);
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delta = tcp_jiffies32 - icsk->icsk_mtup.probe_timestamp;
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if (unlikely(delta >= interval * HZ)) {
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int mss = tcp_current_mss(sk);
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