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tcp: annotate data-race around queue->synflood_warned

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Annotate the lockless read of queue->synflood_warned.

Following xchg() has the needed data-race resolution.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-11-15 09:18:51 +00:00 committed by David S. Miller
parent 1d7322f28f
commit bf36267e3a
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_input.c
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@ -6841,7 +6841,7 @@ static bool tcp_syn_flood_action(const struct sock *sk, const char *proto)
#endif #endif
__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPREQQFULLDROP); __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPREQQFULLDROP);
if (!queue->synflood_warned && syncookies != 2 && if (!READ_ONCE(queue->synflood_warned) && syncookies != 2 &&
xchg(&queue->synflood_warned, 1) == 0) { xchg(&queue->synflood_warned, 1) == 0) {
if (IS_ENABLED(CONFIG_IPV6) && sk->sk_family == AF_INET6) { if (IS_ENABLED(CONFIG_IPV6) && sk->sk_family == AF_INET6) {
net_info_ratelimited("%s: Possible SYN flooding on port [%pI6c]:%u. %s.\n", net_info_ratelimited("%s: Possible SYN flooding on port [%pI6c]:%u. %s.\n",