From patchwork Fri Mar 19 03:01:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Yan X-Patchwork-Id: 12149857 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 658ACC4332B for ; Fri, 19 Mar 2021 02:56:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2601864F33 for ; Fri, 19 Mar 2021 02:56:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231618AbhCSC4H (ORCPT ); Thu, 18 Mar 2021 22:56:07 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:14400 "EHLO szxga06-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233454AbhCSCzq (ORCPT ); Thu, 18 Mar 2021 22:55:46 -0400 Received: from DGGEMS412-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4F1pPv1t1Qzkbx8; Fri, 19 Mar 2021 10:54:11 +0800 (CST) Received: from huawei.com (10.175.127.227) by DGGEMS412-HUB.china.huawei.com (10.3.19.212) with Microsoft SMTP Server id 14.3.498.0; Fri, 19 Mar 2021 10:55:34 +0800 From: Jason Yan To: , , , , , , , CC: , Jason Yan Subject: [PATCH 2/3] scsi: only copy data to user when the whole result is good Date: Fri, 19 Mar 2021 11:01:27 +0800 Message-ID: <20210319030128.1345061-3-yanaijie@huawei.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20210319030128.1345061-1-yanaijie@huawei.com> References: <20210319030128.1345061-1-yanaijie@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.127.227] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org When the scsi device status is offline, mode sense command will return a result with only DID_NO_CONNECT set. Then in sg_scsi_ioctl(), only status byte of the result is checked, and because of bug [1], garbage data is copied to the userspace. Only copy the buffer to userspace when the whole result is good. [1] https://patchwork.kernel.org/project/linux-block/patch/20210318122621.330010-1-yanaijie@huawei.com/ Signed-off-by: Jason Yan --- block/scsi_ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index 6599bac0a78c..359bf0003af4 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -503,7 +503,7 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, if (copy_to_user(sic->data, req->sense, bytes)) err = -EFAULT; } - } else { + } else if (scsi_result_is_good(req->result)) { if (copy_to_user(sic->data, buffer, out_len)) err = -EFAULT; }