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net: annotate lockless accesses to sk->sk_ack_backlog

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sk->sk_ack_backlog can be read without any lock being held.
We need to use READ_ONCE()/WRITE_ONCE() to avoid load/store tearing
and/or potential KCSAN warnings.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2019-11-05 14:11:53 -08:00
committed by David S. Miller
parent 7976a11b30
commit 288efe8606
7 changed files with 9 additions and 9 deletions
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2
net/ipv4/tcp.c
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@@ -3225,7 +3225,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
* tcpi_unacked -> Number of children ready for accept()
* tcpi_sacked -> max backlog
*/
info->tcpi_unacked = sk->sk_ack_backlog;
info->tcpi_unacked = READ_ONCE(sk->sk_ack_backlog);
info->tcpi_sacked = sk->sk_max_ack_backlog;
return;
}