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 CB3EBC433FE for ; Mon, 3 Jan 2022 17:32:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235716AbiACRcx (ORCPT ); Mon, 3 Jan 2022 12:32:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53474 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235958AbiACRbg (ORCPT ); Mon, 3 Jan 2022 12:31:36 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 49034C061397; Mon, 3 Jan 2022 09:31:01 -0800 (PST) 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 dfw.source.kernel.org (Postfix) with ESMTPS id DD85561178; Mon, 3 Jan 2022 17:31:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D37D4C36AEB; Mon, 3 Jan 2022 17:30:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1641231060; bh=SuaPqRIS/EoDXtFwglhRwh+gMYjrD0lXCeGpCJ9cAKU=; h=From:To:Cc:Subject:Date:From; b=QxJFG8DSF6KEIXzSj20jRLpOrQvjBGe0zBHktcXfhJg9hRZSx2CYLnyb5c3UFRJds 7xyE3Q27yuhnAqiHKPzK1/Q6EqQq8zbpjdtSn6laQD5d/J7FSVq5Q5C/OUBqZ9Lrd2 jvp85/JDx+m4To6LZGnMUOMwCzX0qicQDS0CSziPOPxsFaRMavvze81IOwv4XHw+e+ TwD53M1NY5HV41erXmDMSY8wGOhW6F/xRBLfuXyZCo39mi1a+b4raFnnnC0CzV1SK4 r5fEO3O0nYz0VMw4BLGEq/k/Yj66KblUumhGDLcVJKVCa9y8nQDCVPong8QSdQx0lq LPds64J8+IGVA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lixiaokeng , Lu Tixiong , Mike Christie , Lee Duncan , Linfeilong , "Martin K . Petersen" , Sasha Levin , cleech@redhat.com, jejb@linux.ibm.com, open-iscsi@googlegroups.com, linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 1/4] scsi: libiscsi: Fix UAF in iscsi_conn_get_param()/iscsi_conn_teardown() Date: Mon, 3 Jan 2022 12:30:43 -0500 Message-Id: <20220103173047.1613630-1-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Lixiaokeng [ Upstream commit 1b8d0300a3e9f216ae4901bab886db7299899ec6 ] |- iscsi_if_destroy_conn |-dev_attr_show |-iscsi_conn_teardown |-spin_lock_bh |-iscsi_sw_tcp_conn_get_param |-kfree(conn->persistent_address) |-iscsi_conn_get_param |-kfree(conn->local_ipaddr) ==>|-read persistent_address ==>|-read local_ipaddr |-spin_unlock_bh When iscsi_conn_teardown() and iscsi_conn_get_param() happen in parallel, a UAF may be triggered. Link: https://lore.kernel.org/r/046ec8a0-ce95-d3fc-3235-666a7c65b224@huawei.com Reported-by: Lu Tixiong Reviewed-by: Mike Christie Reviewed-by: Lee Duncan Signed-off-by: Lixiaokeng Signed-off-by: Linfeilong Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/libiscsi.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 30e954bb6c81e..8d1a05d5eb4dd 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -2991,6 +2991,8 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) { struct iscsi_conn *conn = cls_conn->dd_data; struct iscsi_session *session = conn->session; + char *tmp_persistent_address = conn->persistent_address; + char *tmp_local_ipaddr = conn->local_ipaddr; del_timer_sync(&conn->transport_timer); @@ -3012,8 +3014,6 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) spin_lock_bh(&session->frwd_lock); free_pages((unsigned long) conn->data, get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); - kfree(conn->persistent_address); - kfree(conn->local_ipaddr); /* regular RX path uses back_lock */ spin_lock_bh(&session->back_lock); kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, @@ -3025,6 +3025,8 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) mutex_unlock(&session->eh_mutex); iscsi_destroy_conn(cls_conn); + kfree(tmp_persistent_address); + kfree(tmp_local_ipaddr); } EXPORT_SYMBOL_GPL(iscsi_conn_teardown); -- 2.34.1