From patchwork Fri Sep 10 01:02:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ding Hui X-Patchwork-Id: 509362 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,USER_AGENT_GIT autolearn=unavailable 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 AF63DC433F5 for ; Fri, 10 Sep 2021 01:12:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A06261051 for ; Fri, 10 Sep 2021 01:12:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236620AbhIJBNc (ORCPT ); Thu, 9 Sep 2021 21:13:32 -0400 Received: from mail-m17642.qiye.163.com ([59.111.176.42]:15870 "EHLO mail-m17642.qiye.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234710AbhIJBM7 (ORCPT ); Thu, 9 Sep 2021 21:12:59 -0400 Received: from localhost.localdomain (unknown [113.116.176.115]) by mail-m17642.qiye.163.com (Hmail) with ESMTPA id 530C2220112; Fri, 10 Sep 2021 09:03:00 +0800 (CST) From: Ding Hui To: lduncan@suse.com, cleech@redhat.com, jejb@linux.ibm.com, martin.petersen@oracle.com, michael.christie@oracle.com, open-iscsi@googlegroups.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Ding Hui Subject: [PATCH 2/3] scsi: libiscsi: fix invalid pointer dereference in iscsi_eh_session_reset Date: Fri, 10 Sep 2021 09:02:19 +0800 Message-Id: <20210910010220.24073-3-dinghui@sangfor.com.cn> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210910010220.24073-1-dinghui@sangfor.com.cn> References: <20210910010220.24073-1-dinghui@sangfor.com.cn> X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgPGg8OCBgUHx5ZQUlOS1dZCBgUCR5ZQVlLVUtZV1 kWDxoPAgseWUFZKDYvK1lXWShZQUhPN1dZLVlBSVdZDwkaFQgSH1lBWRpNTh5WQk9OTElCTBkaTE JJVRMBExYaEhckFA4PWVdZFhoPEhUdFFlBWVVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6OFE6Hyo5Qj4SLB43PS0fSAMr NAIaFAtVSlVKTUhKSUhOTENLQklMVTMWGhIXVR8SFRwTDhI7CBoVHB0UCVUYFBZVGBVFWVdZEgtZ QVlKSkhVSkpNVUpMTVVKSk5ZV1kIAVlBSUhLSjcG X-HM-Tid: 0a7bcd3aafe2d998kuws530c2220112 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org like commit 5db6dd14b313 ("scsi: libiscsi: Fix NULL pointer dereference in iscsi_eh_session_reset"), access conn->persistent_address here is not safe too. The persistent_address is independent of conn refcount, so maybe already freed by iscsi_conn_teardown(), also we put the refcount of conn above, the conn pointer may be invalid. Signed-off-by: Ding Hui --- drivers/scsi/libiscsi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 712a45368385..69b3b2148328 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -2531,8 +2531,8 @@ int iscsi_eh_session_reset(struct scsi_cmnd *sc) spin_lock_bh(&session->frwd_lock); if (session->state == ISCSI_STATE_LOGGED_IN) { ISCSI_DBG_EH(session, - "session reset succeeded for %s,%s\n", - session->targetname, conn->persistent_address); + "session reset succeeded for %s\n", + session->targetname); } else goto failed; spin_unlock_bh(&session->frwd_lock);