From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C4359C433EF for ; Mon, 11 Apr 2022 09:28:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344414AbiDKJao (ORCPT ); Mon, 11 Apr 2022 05:30:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230477AbiDKJal (ORCPT ); Mon, 11 Apr 2022 05:30:41 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 269F13FDB9 for ; Mon, 11 Apr 2022 02:28:28 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id D21C2B810E0 for ; Mon, 11 Apr 2022 09:28:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F2CAC385A3; Mon, 11 Apr 2022 09:28:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649669305; bh=xLXBTGgZgPv8HmqFHIxwKPe2MrLolwXQK1AoxvNtt3Y=; h=Subject:To:Cc:From:Date:From; b=UIhTOnRE0UDwKGWLCkjpKkWJwwDBAvvjL54O8gIemNHe431urK1ywkX34jCFDIlo9 E9jfeIbhUAsmlBsSNNfap89jz5a6+Msqj98MrA/nBGf+kreupz4MY0yKEL0RfDF40P onRUUJg4RYArlt1gvNxK6jbfe+c8JyP7WdaGn9XI= Subject: FAILED: patch "[PATCH] SUNRPC: Don't call connect() more than once on a TCP socket" failed to apply to 5.15-stable tree To: trond.myklebust@hammerspace.com, enrico.scholz@sigma-chemnitz.de Cc: From: Date: Mon, 11 Apr 2022 11:28:23 +0200 Message-ID: <164966930340199@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 89f42494f92f448747bd8a7ab1ae8b5d5520577d Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 16 Mar 2022 19:10:43 -0400 Subject: [PATCH] SUNRPC: Don't call connect() more than once on a TCP socket Avoid socket state races due to repeated calls to ->connect() using the same socket. If connect() returns 0 due to the connection having completed, but we are in fact in a closing state, then we may leave the XPRT_CONNECTING flag set on the transport. Reported-by: Enrico Scholz Fixes: 3be232f11a3c ("SUNRPC: Prevent immediate close+reconnect") Signed-off-by: Trond Myklebust diff --git a/include/linux/sunrpc/xprtsock.h b/include/linux/sunrpc/xprtsock.h index 8c2a712cb242..689062afdd61 100644 --- a/include/linux/sunrpc/xprtsock.h +++ b/include/linux/sunrpc/xprtsock.h @@ -89,5 +89,6 @@ struct sock_xprt { #define XPRT_SOCK_WAKE_WRITE (5) #define XPRT_SOCK_WAKE_PENDING (6) #define XPRT_SOCK_WAKE_DISCONNECT (7) +#define XPRT_SOCK_CONNECT_SENT (8) #endif /* _LINUX_SUNRPC_XPRTSOCK_H */ diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 7e39f87cde2d..8f8a03c3315a 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -2235,10 +2235,15 @@ static void xs_tcp_setup_socket(struct work_struct *work) if (atomic_read(&xprt->swapper)) current->flags |= PF_MEMALLOC; - if (!sock) { - sock = xs_create_sock(xprt, transport, - xs_addr(xprt)->sa_family, SOCK_STREAM, - IPPROTO_TCP, true); + + if (xprt_connected(xprt)) + goto out; + if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT, + &transport->sock_state) || + !sock) { + xs_reset_transport(transport); + sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family, + SOCK_STREAM, IPPROTO_TCP, true); if (IS_ERR(sock)) { xprt_wake_pending_tasks(xprt, PTR_ERR(sock)); goto out; @@ -2262,6 +2267,7 @@ static void xs_tcp_setup_socket(struct work_struct *work) fallthrough; case -EINPROGRESS: /* SYN_SENT! */ + set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state); if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; fallthrough; @@ -2323,13 +2329,9 @@ static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); - if (transport->sock != NULL && !xprt_connecting(xprt)) { + if (transport->sock != NULL) { dprintk("RPC: xs_connect delayed xprt %p for %lu " - "seconds\n", - xprt, xprt->reestablish_timeout / HZ); - - /* Start by resetting any existing state */ - xs_reset_transport(transport); + "seconds\n", xprt, xprt->reestablish_timeout / HZ); delay = xprt_reconnect_delay(xprt); xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);