This is a note to let you know that I've just added the patch titled
tcp/dccp: complete lockless accesses to sk->sk_max_ack_backlog
to the 5.15-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-dccp-complete-lockless-accesses-to-sk-sk_max_ack.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 526eb3030c02433db435d37af38ee92d1d2bb989
Author: Jason Xing <kernelxing@xxxxxxxxxxx>
Date: Sun Mar 31 17:05:21 2024 +0800
tcp/dccp: complete lockless accesses to sk->sk_max_ack_backlog
[ Upstream commit 9a79c65f00e2b036e17af3a3a607d7d732b7affb ]
Since commit 099ecf59f05b ("net: annotate lockless accesses to
sk->sk_max_ack_backlog") decided to handle the sk_max_ack_backlog
locklessly, there is one more function mostly called in TCP/DCCP
cases. So this patch completes it:)
Signed-off-by: Jason Xing <kernelxing@xxxxxxxxxxx>
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240331090521.71965-1-kerneljasonxing@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Stable-dep-of: 3479c7549fb1 ("tcp/dccp: allow a connection when sk_max_ack_backlog is zero")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 53ec06703fe4..0bf19c1926ee 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -278,7 +278,7 @@ static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
{
- return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
+ return inet_csk_reqsk_queue_len(sk) >= READ_ONCE(sk->sk_max_ack_backlog);
}
bool inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
