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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_ipv4.c
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@ -2451,7 +2451,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i)
state = inet_sk_state_load(sk);
if (state == TCP_LISTEN)
rx_queue = sk->sk_ack_backlog;
rx_queue = READ_ONCE(sk->sk_ack_backlog);
else
/* Because we don't lock the socket,
* we might find a transient negative value.