diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-20 19:50:18 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-07-22 14:06:17 +0300 |
| commit | 780476488844e070580bfc9e3bc7832ec1cea883 (patch) | |
| tree | 1c5eccb931a4222e45ac290ef3c7334db3a0df50 | |
| parent | ab1ba21b523ab496b1a4a8e396333b24b0a18f9a (diff) | |
| download | linux-780476488844e070580bfc9e3bc7832ec1cea883.tar.xz | |
tcp: Fix data-races around sysctl_tcp_moderate_rcvbuf.
While reading sysctl_tcp_moderate_rcvbuf, it can be changed
concurrently. Thus, we need to add READ_ONCE() to its readers.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp_input.c | 2 | ||||
| -rw-r--r-- | net/mptcp/protocol.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index af376d7423d1..debfff94f3af 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -724,7 +724,7 @@ void tcp_rcv_space_adjust(struct sock *sk) * <prev RTT . ><current RTT .. ><next RTT .... > */ - if (sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf && + if (READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf) && !(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) { int rcvmem, rcvbuf; u64 rcvwin, grow; diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 21a3ed64226e..9bbd8cbe0acb 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1908,7 +1908,7 @@ static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied) if (msk->rcvq_space.copied <= msk->rcvq_space.space) goto new_measure; - if (sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf && + if (READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf) && !(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) { int rcvmem, rcvbuf; u64 rcvwin, grow; |