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Commit f4b83df0 authored by Kuniyuki Iwashima's avatar Kuniyuki Iwashima Committed by Greg Kroah-Hartman
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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: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: default avatarKuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f240d0ca

net/ipv4/tcp_input.c

+1 −1
Original line number Diff line number Diff line
@@ -439,7 +439,7 @@ 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;