From patchwork Wed Nov 24 12:32:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Karsten Graul X-Patchwork-Id: 12636743 X-Patchwork-Delegate: kuba@kernel.org 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 E73A1C433EF for ; Wed, 24 Nov 2021 12:36:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243740AbhKXMjX (ORCPT ); Wed, 24 Nov 2021 07:39:23 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:58794 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344153AbhKXMg2 (ORCPT ); Wed, 24 Nov 2021 07:36:28 -0500 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1AOCIZxO017917; Wed, 24 Nov 2021 12:33:13 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=Ae9KU6WEzG4WXnQxgT5JCLHknQEMLXP31fjjkZW9Fps=; b=TaSe2ZhFT0c0J1/9YN57Mrq7S22JS5HfZkCEwdzC6Nsue8YqD/aZAcE67XWH5rTdcU0Z u8Ia2/NXK/m4rOEQHwbciWbexXp2T1zIdIL3/bmWurTbyV/xwpCLTcSaxApZBEhk2kVF VHSfAaZ3Kj3EH5oYVVVmXHt3DOkVsit0kyD/C/5Y4xSq7NHy+ZQYty9vN/AN2QdtQeaL xOA0Mj65vg/yLFSH6c1jtLuhatSq6/mH/ydxwym9C530w5zQ5qyWpOKMfmGJqdl9Klom FsnjSrqkJpGaORbPd50zWRT627FfW+6Sr37IqUEQR9Z34i4Orroziip94FV9BORSJvsx fg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3chn9588qf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 24 Nov 2021 12:33:13 +0000 Received: from m0098410.ppops.net (m0098410.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 1AOCTXTm031220; Wed, 24 Nov 2021 12:33:13 GMT Received: from ppma04fra.de.ibm.com (6a.4a.5195.ip4.static.sl-reverse.com [149.81.74.106]) by mx0a-001b2d01.pphosted.com with ESMTP id 3chn9588py-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 24 Nov 2021 12:33:12 +0000 Received: from pps.filterd (ppma04fra.de.ibm.com [127.0.0.1]) by ppma04fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 1AOCX1sX023935; Wed, 24 Nov 2021 12:33:10 GMT Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by ppma04fra.de.ibm.com with ESMTP id 3cernbg1ex-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 24 Nov 2021 12:33:10 +0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 1AOCX73u25559390 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 24 Nov 2021 12:33:07 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E2DD011C054; Wed, 24 Nov 2021 12:33:06 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A1F1C11C05C; Wed, 24 Nov 2021 12:33:06 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 24 Nov 2021 12:33:06 +0000 (GMT) From: Karsten Graul To: David Miller , Jakub Kicinski Cc: netdev@vger.kernel.org, linux-s390@vger.kernel.org, Heiko Carstens , Julian Wiedmann , Guo DaXing , Tony Lu Subject: [PATCH net 2/2] net/smc: Fix loop in smc_listen Date: Wed, 24 Nov 2021 13:32:38 +0100 Message-Id: <20211124123238.471429-3-kgraul@linux.ibm.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211124123238.471429-1-kgraul@linux.ibm.com> References: <20211124123238.471429-1-kgraul@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: my7Oy8ZRKRO8xwgcV3wtXoXn9Rlt1o3F X-Proofpoint-GUID: dPSPHUaBqBy6uzEKySH5ck1-pf8FKRwa X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-24_04,2021-11-24_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 mlxlogscore=973 impostorscore=0 bulkscore=0 suspectscore=0 spamscore=0 malwarescore=0 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111240070 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Guo DaXing The kernel_listen function in smc_listen will fail when all the available ports are occupied. At this point smc->clcsock->sk->sk_data_ready has been changed to smc_clcsock_data_ready. When we call smc_listen again, now both smc->clcsock->sk->sk_data_ready and smc->clcsk_data_ready point to the smc_clcsock_data_ready function. The smc_clcsock_data_ready() function calls lsmc->clcsk_data_ready which now points to itself resulting in an infinite loop. This patch restores smc->clcsock->sk->sk_data_ready with the old value. Fixes: a60a2b1e0af1 ("net/smc: reduce active tcp_listen workers") Signed-off-by: Guo DaXing Acked-by: Tony Lu Signed-off-by: Karsten Graul --- net/smc/af_smc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index b61c802e3bf3..53a617cbbec4 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -2134,8 +2134,10 @@ static int smc_listen(struct socket *sock, int backlog) smc->clcsock->sk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); rc = kernel_listen(smc->clcsock, backlog); - if (rc) + if (rc) { + smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready; goto out; + } sk->sk_max_ack_backlog = backlog; sk->sk_ack_backlog = 0; sk->sk_state = SMC_LISTEN;