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net: annotate lockless accesses to sk->sk_max_ack_backlog

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sk->sk_max_ack_backlog can be read without any lock being held
at least in TCP/DCCP cases.

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 14:11:54 -08:00 • committed by David S. Miller
parent 288efe8606
commit 099ecf59f0
9 changed files with 10 additions and 10 deletions
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2
net/ipv4/af_inet.c
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@ -208,7 +208,7 @@ int inet_listen(struct socket *sock, int backlog)
if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
goto out;
sk->sk_max_ack_backlog = backlog;
WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
/* Really, if the socket is already in listen state
* we can only allow the backlog to be adjusted.
*/