From patchwork Wed Apr 7 01:24:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wenchao Hao X-Patchwork-Id: 417130 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7502C433ED for ; Wed, 7 Apr 2021 01:24:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8FC6F61369 for ; Wed, 7 Apr 2021 01:24:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347673AbhDGBY4 (ORCPT ); Tue, 6 Apr 2021 21:24:56 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:15142 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234200AbhDGBYx (ORCPT ); Tue, 6 Apr 2021 21:24:53 -0400 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4FFRSj1qhnzpVNR; Wed, 7 Apr 2021 09:21:57 +0800 (CST) Received: from huawei.com (10.175.101.6) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.498.0; Wed, 7 Apr 2021 09:24:33 +0800 From: Wenchao Hao To: Lee Duncan , Chris Leech , "James E . J . Bottomley" , "Martin K . Petersen" CC: , , , Wu Bo , , Wenchao Hao Subject: [PATCH 2/2] scsi: iscsi_tcp: Fix use-after-free in iscsi_sw_tcp_host_get_param() Date: Wed, 7 Apr 2021 09:24:50 +0800 Message-ID: <20210407012450.97754-3-haowenchao@huawei.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210407012450.97754-1-haowenchao@huawei.com> References: <20210407012450.97754-1-haowenchao@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org iscsi_sw_tcp_host_get_param() would access struct iscsi_session, while struct iscsi_session might be freed by session destroy flow in iscsi_free_session(). This commit fix this condition by freeing session after host has already been removed. Signed-off-by: Wenchao Hao --- drivers/scsi/iscsi_tcp.c | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-) diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index dd33ce0e3737..d559abd3694c 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -839,6 +839,18 @@ iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, iscsi_tcp_conn_get_stats(cls_conn, stats); } +static void +iscsi_sw_tcp_session_teardown(struct iscsi_cls_session *cls_session) +{ + struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); + + iscsi_session_destroy(cls_session); + iscsi_host_remove(shost); + + iscsi_free_session(cls_session); + iscsi_host_free(shost); +} + static struct iscsi_cls_session * iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, uint16_t qdepth, uint32_t initial_cmdsn) @@ -884,12 +896,13 @@ iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, tcp_sw_host = iscsi_host_priv(shost); tcp_sw_host->session = session; - if (iscsi_tcp_r2tpool_alloc(session)) - goto remove_session; + if (iscsi_tcp_r2tpool_alloc(session)) { + iscsi_sw_tcp_session_teardown(cls_session); + return NULL; + } + return cls_session; -remove_session: - iscsi_session_teardown(cls_session); remove_host: iscsi_host_remove(shost); free_host: @@ -899,17 +912,13 @@ iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) { - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); struct iscsi_session *session = cls_session->dd_data; if (WARN_ON_ONCE(session->leadconn)) return; iscsi_tcp_r2tpool_free(cls_session->dd_data); - iscsi_session_teardown(cls_session); - - iscsi_host_remove(shost); - iscsi_host_free(shost); + iscsi_sw_tcp_session_teardown(cls_session); } static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)