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 X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 3D25BECE562 for ; Thu, 20 Sep 2018 02:41:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D9DE121521 for ; Thu, 20 Sep 2018 02:41:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D9DE121521 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731366AbeITIWl (ORCPT ); Thu, 20 Sep 2018 04:22:41 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:12650 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726006AbeITIWl (ORCPT ); Thu, 20 Sep 2018 04:22:41 -0400 Received: from DGGEMS403-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 5B7B626923B20; Thu, 20 Sep 2018 10:41:38 +0800 (CST) Received: from linux-ibm.site (10.175.102.37) by DGGEMS403-HUB.china.huawei.com (10.3.19.203) with Microsoft SMTP Server id 14.3.399.0; Thu, 20 Sep 2018 10:41:35 +0800 From: zhong jiang To: CC: , , , Subject: [PATCH] misc: genwqe: should return proper error value. Date: Thu, 20 Sep 2018 10:29:13 +0800 Message-ID: <1537410553-23836-1-git-send-email-zhongjiang@huawei.com> X-Mailer: git-send-email 1.7.12.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.102.37] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The function should return -EFAULT when copy_from_user fails. Even though the caller does not distinguish them. but we should keep backward compatibility. Signed-off-by: zhong jiang --- drivers/misc/genwqe/card_utils.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/misc/genwqe/card_utils.c b/drivers/misc/genwqe/card_utils.c index 8679e0b..f0961ec 100644 --- a/drivers/misc/genwqe/card_utils.c +++ b/drivers/misc/genwqe/card_utils.c @@ -298,7 +298,7 @@ static int genwqe_sgl_size(int num_pages) int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, void __user *user_addr, size_t user_size, int write) { - int rc; + int ret = -ENOMEM; struct pci_dev *pci_dev = cd->pci_dev; sgl->fpage_offs = offset_in_page((unsigned long)user_addr); @@ -318,7 +318,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, if (get_order(sgl->sgl_size) > MAX_ORDER) { dev_err(&pci_dev->dev, "[%s] err: too much memory requested!\n", __func__); - return -ENOMEM; + return ret; } sgl->sgl = __genwqe_alloc_consistent(cd, sgl->sgl_size, @@ -326,7 +326,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, if (sgl->sgl == NULL) { dev_err(&pci_dev->dev, "[%s] err: no memory available!\n", __func__); - return -ENOMEM; + return ret; } /* Only use buffering on incomplete pages */ @@ -339,7 +339,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, /* Sync with user memory */ if (copy_from_user(sgl->fpage + sgl->fpage_offs, user_addr, sgl->fpage_size)) { - rc = -EFAULT; + ret = -EFAULT; goto err_out; } } @@ -352,7 +352,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, /* Sync with user memory */ if (copy_from_user(sgl->lpage, user_addr + user_size - sgl->lpage_size, sgl->lpage_size)) { - rc = -EFAULT; + ret = -EFAULT; goto err_out2; } } @@ -374,7 +374,8 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, sgl->sgl = NULL; sgl->sgl_dma_addr = 0; sgl->sgl_size = 0; - return -ENOMEM; + + return ret; } int genwqe_setup_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, -- 1.7.12.4