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tcp: Fix a data-race around sysctl_tcp_nometrics_save.
commit8499a2454d
upstream. While reading sysctl_tcp_nometrics_save, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes:1da177e4c3
("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 1 additions and 1 deletions
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@ -329,7 +329,7 @@ void tcp_update_metrics(struct sock *sk)
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int m;
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sk_dst_confirm(sk);
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if (net->ipv4.sysctl_tcp_nometrics_save || !dst)
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if (READ_ONCE(net->ipv4.sysctl_tcp_nometrics_save) || !dst)
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return;
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rcu_read_lock();
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