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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-20 09:50:13 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-11 12:48:38 +0200 |
| commit | 4b4d0f7d204eca946881d7233b131cec0b00e889 (patch) | |
| tree | 2910fa649aa3f933fea42d5b73d6bc5c440bb2d9 /net/ipv4 | |
| parent | 62acabe02a2b1a65be563e1a8825f80dcb059aed (diff) | |
| download | linux-stable-4b4d0f7d204eca946881d7233b131cec0b00e889.tar.gz linux-stable-4b4d0f7d204eca946881d7233b131cec0b00e889.tar.bz2 linux-stable-4b4d0f7d204eca946881d7233b131cec0b00e889.zip | |
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/ipv4')
| -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 9e0bdce7b9ea..484585171e88 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -432,7 +432,7 @@ static void tcp_grow_window(struct sock *sk, const struct sk_buff *skb) */ 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; |