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authorEric Dumazet <edumazet@google.com>2022-11-15 09:18:51 +0000
committerDavid S. Miller <davem@davemloft.net>2022-11-16 13:32:53 +0000
commitbf36267e3ad3df80a3a18eb0422723069a434934 (patch)
tree698aa0d1372d12317be857fd00305b399c91115c /net/ipv4
parent1d7322f28fde3f90f2a2ed0b62fafc004b3f822a (diff)
tcp: annotate data-race around queue->synflood_warned
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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_input.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 94024fdc2da1..0ae291e53eab 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6841,7 +6841,7 @@ static bool tcp_syn_flood_action(const struct sock *sk, const char *proto)
#endif
__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) {
if (IS_ENABLED(CONFIG_IPV6) && sk->sk_family == AF_INET6) {
net_info_ratelimited("%s: Possible SYN flooding on port [%pI6c]:%u. %s.\n",