From patchwork Mon Apr 10 06:43:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhijian Li (Fujitsu)" X-Patchwork-Id: 13206120 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 8E645C76196 for ; Mon, 10 Apr 2023 06:43:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229724AbjDJGnu (ORCPT ); Mon, 10 Apr 2023 02:43:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49486 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229743AbjDJGnn (ORCPT ); Mon, 10 Apr 2023 02:43:43 -0400 Received: from mail3.bemta32.messagelabs.com (mail3.bemta32.messagelabs.com [195.245.230.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 176692D6A; Sun, 9 Apr 2023 23:43:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fujitsu.com; s=170520fj; t=1681109018; i=@fujitsu.com; bh=4cYvlyImJig+3PsNpJOM0kOmh8zSDTANyqqOA8qFK9o=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ACGymuscUKaNZuKVvZbv+Mr7q7ojEnxrDwMItz0uwmsQeTAowFI2pVJ7pOm2jniE3 ReDK/Z4cbNV+KiKWO0FJS4eQ/CCjrdeA654lxO6YesNqL8B4jjLBs5TJYBFBW4Yjey c+ehOYtpKQi+UvYSr3JPxjMTNz2a6HmT9J/ZhzwzdCvdHKSn8WqRORhnvXcruwN2eG SrDS13OjQOhv9X0i495P15CYdpO+VUNxTBQJPMmiGP0ePavJCUj3DTm2DlTj0O8dyo w/eoX/m4UeC3UGnghI5/n7Hs/+nLQSfUdjTSTDDvmVdmNf8/qkr8nzJKUkoWaD5eq6 RFn3VWgoINvqg== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpkleJIrShJLcpLzFFi42Kxs+FI0pXcYJx i8Gwim8WNaXIW205vYLeYOeMEo8XbTVNYLKb8WspscXnXHDaLZ4d6WRzYPU6/ucPksWlVJ5vH woapzB6fN8l5bP18myWANYo1My8pvyKBNePzxO/sBTsVKxZNn8bewHhUuouRi0NIYCOjxKmPh 5ggnCVMEudWv2TvYuQEcvYzSkztrgOx2QQ0JO613GQEsUUESiUOt+0Dq2EWSJKYd/stM4gtLB ApsXdxNxOIzSKgKvF/7jYwm1fAUeJf80swW0JAQWLKw/dg9ZwCThINrRdZIXY5SlxZ38gIUS8 ocXLmExaI+RISB1+8YIboVZQ40vmXBcKukGicfghqpprE1XObmCcwCs5C0j4LSfsCRqZVjKbF qUVlqUW65npJRZnpGSW5iZk5eolVuol6qaW65anFJbqGeonlxXqpxcV6xZW5yTkpenmpJZsYg bGRUsz0bgfj8r6/eocYJTmYlER5u7iMU4T4kvJTKjMSizPii0pzUosPMcpwcChJ8H5fAJQTLE pNT61Iy8wBxilMWoKDR0mE98QyoDRvcUFibnFmOkTqFKMux4YHB/YyC7Hk5eelSonz/loHVCQ AUpRRmgc3ApYyLjHKSgnzMjIwMAjxFKQW5WaWoMq/YhTnYFQS5p0EsoonM68EbtMroCOYgI7g cjEAOaIkESEl1cD0MnqfTtQazuZdupusrplwhtqckjDP3pEiYDNh09vSR8q+rVeOrX9XI+udn LC5U3FxoNyZqnQpplsuqgrycxP+lBSeOHvtzJHibsf+/jLRE6ITOAUlbNW+3a9eeshN0NrdY8 FmkwCl/BBm6U+bqrdFXVXTOBRv/rL26082BqZY3xXt/3880JeZm/x19+R1X/40VXeWfi4591k xlPHVgylHt5i/nR3ONn37tSNzlpr8cvqum7LMgvuR/rF7fSulG2dnW+z2mD3lt/HrC11MK+xa MqMf2c1ZrTbpz73JR24zr4x6Jn5ayuaj7QrBG6szaidsfup/NLm25WO+rq1LWKTLfebwO6XuS dPPhjpbns9VYinOSDTUYi4qTgQAMVHzWpQDAAA= X-Env-Sender: lizhijian@fujitsu.com X-Msg-Ref: server-12.tower-585.messagelabs.com!1681109016!187050!1 X-Originating-IP: [62.60.8.98] X-SYMC-ESS-Client-Auth: outbound-route-from=pass X-StarScan-Received: X-StarScan-Version: 9.104.2; banners=-,-,- X-VirusChecked: Checked Received: (qmail 7574 invoked from network); 10 Apr 2023 06:43:37 -0000 Received: from unknown (HELO n03ukasimr03.n03.fujitsu.local) (62.60.8.98) by server-12.tower-585.messagelabs.com with ECDHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 10 Apr 2023 06:43:37 -0000 Received: from n03ukasimr03.n03.fujitsu.local (localhost [127.0.0.1]) by n03ukasimr03.n03.fujitsu.local (Postfix) with ESMTP id A91CD1CD; Mon, 10 Apr 2023 07:43:36 +0100 (BST) Received: from R01UKEXCASM121.r01.fujitsu.local (R01UKEXCASM121 [10.183.43.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by n03ukasimr03.n03.fujitsu.local (Postfix) with ESMTPS id 9D5E71C7; Mon, 10 Apr 2023 07:43:36 +0100 (BST) Received: from 31d618797ed9.localdomain (10.167.226.45) by R01UKEXCASM121.r01.fujitsu.local (10.183.43.173) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Mon, 10 Apr 2023 07:43:33 +0100 From: Li Zhijian To: , , , , CC: , , Li Zhijian Subject: [PATCH for-next 3/3] RDMA/rtrs: Avoid use-after-free in rtrs_clt_rdma_cm_handler Date: Mon, 10 Apr 2023 06:43:04 +0000 Message-ID: <1681108984-2-4-git-send-email-lizhijian@fujitsu.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1681108984-2-1-git-send-email-lizhijian@fujitsu.com> References: <1681108984-2-1-git-send-email-lizhijian@fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.45] X-ClientProxiedBy: G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.80) To R01UKEXCASM121.r01.fujitsu.local (10.183.43.173) X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Currently, con will be destroyed when wait_event_interruptible_timeout() returns ERESTARTSYS. But the in-flight event handler rtrs_clt_rdma_cm_handler() could be rescheduled/wakeup which may cause a use-after-free. WARNING: CPU: 0 PID: 14766 at drivers/infiniband/ulp/rtrs/rtrs-clt.c:1687 rtrs_clt_rdma_cm_handler+0x620/0x640 [rtrs_client] Modules linked in: rnbd_client rtrs_client rtrs_core rdma_cm iw_cm ib_cm rdma_rxe ib_uverbs ib_core libiscsi scsi_transport_iscsi crc32_generic udp_tunnel dax_pmem nd_pmem nd_btt virtiofs crc32c_intel nvme fuse nvme_core nfit libnvdimm dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua dm_mirror dm_region_hash dm_log dm_mod [last unloaded: ib_core] CPU: 0 PID: 14766 Comm: kworker/u2:3 Kdump: loaded Tainted: G W 6.2.0-rc6-roce-flush+ #56 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 Workqueue: ib_addr process_one_req [ib_core] RIP: 0010:rtrs_clt_rdma_cm_handler+0x620/0x640 [rtrs_client] Code: 00 0f 85 5f fd ff ff 4c 8b 23 41 bd f4 ff ff ff e9 95 fb ff ff 0f 0b 4c 89 f7 41 bd ea ff ff ff e8 75 c8 92 ec e9 4b ff ff ff <0f> 0b 4c 89 f7 41 bd ea ff ff ff e8 60 c8 92 ec e9 36 ff ff ff e8 RSP: 0018:ffffa4ef41cdbc60 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff9372c394e600 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffffad634277 RBP: ffffa4ef41cdbd00 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000003ff3 R11: 0000000000000000 R12: ffff9372c3164800 R13: ffff9372c3164800 R14: ffff9372c394e640 R15: ffff9372c5219020 FS: 0000000000000000(0000) GS:ffff9372fbc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f35bb7d5de0 CR3: 0000000020c2a006 CR4: 00000000001706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? mark_held_locks+0x49/0x80 ? lock_is_held_type+0xd7/0x130 ? cma_cm_event_handler+0x49/0x200 [rdma_cm] cma_cm_event_handler+0x49/0x200 [rdma_cm] addr_handler+0xf1/0x1e0 [rdma_cm] ? lock_acquire+0xca/0x2f0 ? lock_acquire+0xda/0x2f0 process_one_req+0x43/0x170 [ib_core] process_one_work+0x274/0x590 worker_thread+0x4f/0x3d0 ? __pfx_worker_thread+0x10/0x10 kthread+0xe7/0x110 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2c/0x50 irq event stamp: 1432669 hardirqs last enabled at (1432683): [] __up_console_sem+0x52/0x60 hardirqs last disabled at (1432698): [] __up_console_sem+0x37/0x60 softirqs last enabled at (1432518): [] __irq_exit_rcu+0xc5/0x120 softirqs last disabled at (1432509): [] __irq_exit_rcu+0xc5/0x120 ---[ end trace 0000000000000000 ]--- Signed-off-by: Li Zhijian --- drivers/infiniband/ulp/rtrs/rtrs-clt.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c index 4c8f42e46e2f..760a7eb51297 100644 --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c @@ -2074,6 +2074,7 @@ static int create_cm(struct rtrs_clt_con *con) rtrs_err(s, "Failed to resolve address, err: %d\n", err); goto destroy_cm; } +again: /* * Combine connection status and session events. This is needed * for waiting two possible cases: cm_err has something meaningful @@ -2083,10 +2084,15 @@ static int create_cm(struct rtrs_clt_con *con) clt_path->state_wq, con->cm_err || clt_path->state != RTRS_CLT_CONNECTING, msecs_to_jiffies(RTRS_CONNECT_TIMEOUT_MS)); - if (err == 0 || err == -ERESTARTSYS) { - if (err == 0) - err = -ETIMEDOUT; - /* Timedout or interrupted */ + if (err == -ERESTARTSYS) { + /* interrupted, + * try again to avoid the in-flight rtrs_clt_rdma_cm_handler() + * getting a use-after-free + */ + goto again; + } else if (err == 0) { + err = -ETIMEDOUT; + /* Timedout */ goto errr; } if (con->cm_err < 0) {