Patch "tcp: annotate data-races around icsk->icsk_syn_retries" has been added to the 6.1-stable tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This is a note to let you know that I've just added the patch titled

    tcp: annotate data-races around icsk->icsk_syn_retries

to the 6.1-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:
     tcp-annotate-data-races-around-icsk-icsk_syn_retries.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit ae744dd736807b48f042d785128b2d771387f69c
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date:   Wed Jul 19 21:28:52 2023 +0000

    tcp: annotate data-races around icsk->icsk_syn_retries
    
    [ Upstream commit 3a037f0f3c4bfe44518f2fbb478aa2f99a9cd8bb ]
    
    do_tcp_getsockopt() and reqsk_timer_handler() read
    icsk->icsk_syn_retries while another cpu might change its value.
    
    Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
    Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230719212857.3943972-7-edumazet@xxxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 8e35ea66d930a..62a3b103f258a 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -1016,7 +1016,7 @@ static void reqsk_timer_handler(struct timer_list *t)
 
 	icsk = inet_csk(sk_listener);
 	net = sock_net(sk_listener);
-	max_syn_ack_retries = icsk->icsk_syn_retries ? :
+	max_syn_ack_retries = READ_ONCE(icsk->icsk_syn_retries) ? :
 		READ_ONCE(net->ipv4.sysctl_tcp_synack_retries);
 	/* Normally all the openreqs are young and become mature
 	 * (i.e. converted to established socket) for first timeout.
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 7d75928ea0f9c..ffa9717293358 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3397,7 +3397,7 @@ int tcp_sock_set_syncnt(struct sock *sk, int val)
 		return -EINVAL;
 
 	lock_sock(sk);
-	inet_csk(sk)->icsk_syn_retries = val;
+	WRITE_ONCE(inet_csk(sk)->icsk_syn_retries, val);
 	release_sock(sk);
 	return 0;
 }
@@ -3678,7 +3678,7 @@ int do_tcp_setsockopt(struct sock *sk, int level, int optname,
 		if (val < 1 || val > MAX_TCP_SYNCNT)
 			err = -EINVAL;
 		else
-			icsk->icsk_syn_retries = val;
+			WRITE_ONCE(icsk->icsk_syn_retries, val);
 		break;
 
 	case TCP_SAVE_SYN:
@@ -4095,7 +4095,7 @@ int do_tcp_getsockopt(struct sock *sk, int level,
 		val = keepalive_probes(tp);
 		break;
 	case TCP_SYNCNT:
-		val = icsk->icsk_syn_retries ? :
+		val = READ_ONCE(icsk->icsk_syn_retries) ? :
 			READ_ONCE(net->ipv4.sysctl_tcp_syn_retries);
 		break;
 	case TCP_LINGER2:



[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux