This is a note to let you know that I've just added the patch titled
ip: Fix a data-race around sysctl_ip_autobind_reuse.
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ip-fix-a-data-race-around-sysctl_ip_autobind_reuse.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 72b3cbb749d4c8616914e465be7b03be18329503
Author: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Date: Wed Jul 13 13:51:56 2022 -0700
ip: Fix a data-race around sysctl_ip_autobind_reuse.
[ Upstream commit 0db232765887d9807df8bcb7b6f29b2871539eab ]
While reading sysctl_ip_autobind_reuse, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: 4b01a9674231 ("tcp: bind(0) remove the SO_REUSEADDR restriction when ephemeral ports are exhausted.")
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 1e5b53c2bb26..dfb5a2d7ad85 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -259,7 +259,7 @@ inet_csk_find_open_port(struct sock *sk, struct inet_bind_bucket **tb_ret, int *
goto other_half_scan;
}
- if (net->ipv4.sysctl_ip_autobind_reuse && !relax) {
+ if (READ_ONCE(net->ipv4.sysctl_ip_autobind_reuse) && !relax) {
/* We still have a chance to connect to different destinations */
relax = true;
goto ports_exhausted;
