This is a note to let you know that I've just added the patch titled
tipc: fix partial topology connection closure
to the 4.19-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:
tipc-fix-partial-topology-connection-closure.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue 12 May 2020 10:57:53 AM CEST
From: Tuong Lien <tuong.t.lien@xxxxxxxxxxxxxx>
Date: Mon, 4 May 2020 11:15:54 +0700
Subject: tipc: fix partial topology connection closure
From: Tuong Lien <tuong.t.lien@xxxxxxxxxxxxxx>
[ Upstream commit 980d69276f3048af43a045be2925dacfb898a7be ]
When an application connects to the TIPC topology server and subscribes
to some services, a new connection is created along with some objects -
'tipc_subscription' to store related data correspondingly...
However, there is one omission in the connection handling that when the
connection or application is orderly shutdown (e.g. via SIGQUIT, etc.),
the connection is not closed in kernel, the 'tipc_subscription' objects
are not freed too.
This results in:
- The maximum number of subscriptions (65535) will be reached soon, new
subscriptions will be rejected;
- TIPC module cannot be removed (unless the objects are somehow forced
to release first);
The commit fixes the issue by closing the connection if the 'recvmsg()'
returns '0' i.e. when the peer is shutdown gracefully. It also includes
the other unexpected cases.
Acked-by: Jon Maloy <jmaloy@xxxxxxxxxx>
Acked-by: Ying Xue <ying.xue@xxxxxxxxxxxxx>
Signed-off-by: Tuong Lien <tuong.t.lien@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/tipc/topsrv.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/net/tipc/topsrv.c
+++ b/net/tipc/topsrv.c
@@ -409,10 +409,11 @@ static int tipc_conn_rcv_from_sock(struc
read_lock_bh(&sk->sk_callback_lock);
ret = tipc_conn_rcv_sub(srv, con, &s);
read_unlock_bh(&sk->sk_callback_lock);
+ if (!ret)
+ return 0;
}
- if (ret < 0)
- tipc_conn_close(con);
+ tipc_conn_close(con);
return ret;
}
Patches currently in stable-queue which might be from tuong.t.lien@xxxxxxxxxxxxxx are
queue-4.19/tipc-fix-partial-topology-connection-closure.patch
