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authorKuniyuki Iwashima <kuniyu@amazon.com>2022-07-15 20:17:50 +0300
committerDavid S. Miller <davem@davemloft.net>2022-07-18 14:21:54 +0300
commit39e24435a776e9de5c6dd188836cf2523547804b (patch)
treece395ff289b73323451466c54d20b0c8bf4668f0 /include
parent46778cd16e6a5ad1b2e3a91f6c057c907379418e (diff)
downloadlinux-39e24435a776e9de5c6dd188836cf2523547804b.tar.xz
tcp: Fix data-races around some timeout sysctl knobs.
While reading these sysctl knobs, they can be changed concurrently. Thus, we need to add READ_ONCE() to their readers. - tcp_retries1 - tcp_retries2 - tcp_orphan_retries - tcp_fin_timeout Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/tcp.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 204478d5d388..23ccaa386746 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1523,7 +1523,8 @@ static inline u32 keepalive_time_elapsed(const struct tcp_sock *tp)
static inline int tcp_fin_time(const struct sock *sk)
{
- int fin_timeout = tcp_sk(sk)->linger2 ? : sock_net(sk)->ipv4.sysctl_tcp_fin_timeout;
+ int fin_timeout = tcp_sk(sk)->linger2 ? :
+ READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fin_timeout);
const int rto = inet_csk(sk)->icsk_rto;
if (fin_timeout < (rto << 2) - (rto >> 1))