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tcp: Fix a data-race around sysctl_tcp_tw_reuse.

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[ Upstream commit cbfc6495586a3f09f6f07d9fb3c7cafe807e3c55 ]

While reading sysctl_tcp_tw_reuse, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kuniyuki Iwashima
2022-07-15 10:17:52 -07:00
committed by Greg Kroah-Hartman
parent fd6f1284e3
commit b6c189aa80
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_ipv4.c
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@@ -106,10 +106,10 @@ static u32 tcp_v4_init_ts_off(const struct net *net, const struct sk_buff *skb)
int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp)
{ {
int reuse = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_tw_reuse);
const struct inet_timewait_sock *tw = inet_twsk(sktw); const struct inet_timewait_sock *tw = inet_twsk(sktw);
const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw);
struct tcp_sock *tp = tcp_sk(sk); struct tcp_sock *tp = tcp_sk(sk);
int reuse = sock_net(sk)->ipv4.sysctl_tcp_tw_reuse;
if (reuse == 2) { if (reuse == 2) {
/* Still does not detect *everything* that goes through /* Still does not detect *everything* that goes through