From patchwork Mon Mar 8 12:31:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 395902 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 43961C433E0 for ; Mon, 8 Mar 2021 12:35:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EF567651DC for ; Mon, 8 Mar 2021 12:35:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231589AbhCHMev (ORCPT ); Mon, 8 Mar 2021 07:34:51 -0500 Received: from mail.kernel.org ([198.145.29.99]:43498 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229591AbhCHMej (ORCPT ); Mon, 8 Mar 2021 07:34:39 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 76D76651C3; Mon, 8 Mar 2021 12:34:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615206879; bh=0XrOwaHgvfjbL088LeHoqB7jc9U+zNxCKkws2sLNpzM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EgOkVd8V6bS1uMI/u2Usjw276LF6tMzHBhGHHnYh/LHvZWhtir9rc+aCC2D5Qf7+L p1Pxt/RewNxPwafxezTGFhWbEaiq21brIyqLcAI01SE+rwSiAiDsNZb2R0o4NwBBR4 /466M25HVHHuM22LYk7FFQqniFPCSyaaqZpUi/xQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Jens Axboe , Sasha Levin Subject: [PATCH 5.10 37/42] rsxx: Return -EFAULT if copy_to_user() fails Date: Mon, 8 Mar 2021 13:31:03 +0100 Message-Id: <20210308122719.928917471@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210308122718.120213856@linuxfoundation.org> References: <20210308122718.120213856@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dan Carpenter [ Upstream commit 77516d25f54912a7baedeeac1b1b828b6f285152 ] The copy_to_user() function returns the number of bytes remaining but we want to return -EFAULT to the user if it can't complete the copy. The "st" variable only holds zero on success or negative error codes on failure so the type should be int. Fixes: 36f988e978f8 ("rsxx: Adding in debugfs entries.") Signed-off-by: Dan Carpenter Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/rsxx/core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/block/rsxx/core.c b/drivers/block/rsxx/core.c index 63f549889f87..5ac1881396af 100644 --- a/drivers/block/rsxx/core.c +++ b/drivers/block/rsxx/core.c @@ -165,15 +165,17 @@ static ssize_t rsxx_cram_read(struct file *fp, char __user *ubuf, { struct rsxx_cardinfo *card = file_inode(fp)->i_private; char *buf; - ssize_t st; + int st; buf = kzalloc(cnt, GFP_KERNEL); if (!buf) return -ENOMEM; st = rsxx_creg_read(card, CREG_ADD_CRAM + (u32)*ppos, cnt, buf, 1); - if (!st) - st = copy_to_user(ubuf, buf, cnt); + if (!st) { + if (copy_to_user(ubuf, buf, cnt)) + st = -EFAULT; + } kfree(buf); if (st) return st;