diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-20 19:50:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-03 13:00:44 +0300 |
| commit | 3cddb7a7a5d5ceaf02354b127e64985d09f83e9a (patch) | |
| tree | cb610197a25bfe70bed1119901cbe8d7f195cc52 /net | |
| parent | f10a5f905a97cb31e0d8a151c5af5fd2e4494f91 (diff) | |
| download | linux-3cddb7a7a5d5ceaf02354b127e64985d09f83e9a.tar.xz | |
tcp: Fix a data-race around sysctl_tcp_app_win.
commit 02ca527ac5581cf56749db9fd03d854e842253dd upstream.
While reading sysctl_tcp_app_win, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: 1da177e4c3f4 ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_input.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index e50da18912dd..875064ddb9ee 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -503,7 +503,7 @@ static void tcp_grow_window(struct sock *sk, const struct sk_buff *skb) */ static void tcp_init_buffer_space(struct sock *sk) { - int tcp_app_win = sock_net(sk)->ipv4.sysctl_tcp_app_win; + int tcp_app_win = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_app_win); struct tcp_sock *tp = tcp_sk(sk); int maxwin; |