From patchwork Mon Oct 24 11:30:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 9633 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp532398wru; Mon, 24 Oct 2022 09:07:57 -0700 (PDT) X-Google-Smtp-Source: AMsMyM4rWsyybxH+l9QC8KfFiO/SfQZwnBF6XMls75XkyyjWVBqxyq2G9QnIW+dzClVJD3ctw0wR X-Received: by 2002:a17:907:96a0:b0:78d:dd45:a6d4 with SMTP id hd32-20020a17090796a000b0078ddd45a6d4mr28602012ejc.643.1666627677580; Mon, 24 Oct 2022 09:07:57 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1666627677; cv=none; d=google.com; s=arc-20160816; b=BPDegKSBF1KGzs8Rud4XursvEL/JMf3+Qe4aNdVqIFL1T/0GTQPbG1AJ3DUs/F4I8X rSjKZL4VMJnVdFljVXcV8Fu+a5rCpzDkTCzQHvAK0cowlAdCiGEie6LCgcb7t+A686Ct aA/3N32IbZgBqk/RgrNCE0NxVO5JohISlzlZwRWfeuJglPQDoiZrktww0vuVYngaaQG6 IwKNDUiz8V0L1dA7PMuV0YQHPAH6AKP2Y6Fdnhk7d4kB4FxRDhbXdNOfgv8idU1tJYgM naknA4m+MAKWAghs6oTk2LRqToBf3/NJJ6wKD3fOKu7tO/IrBzTVE15ObdLQ8WAago6m VNFw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=lIufeqATEhtdcEH+uVyvdR/iXs36IpS+qTXkAXvRT0o=; b=NjOtmHdcNzqO6BKcQG2E2TKCc2+unmap97mqtNQQ2II0xZY0/pASnTFaVRcV/7H2IH nNa9Dl+OIrp/nhDmENrNCiiypo/BmMhMtioG7bIWRgTeegRzhW6pv9Lu1AND19VjfMMM deH/CnYIPqqm43EA4dEGlfLNFoIGhf8GATB6gbUJB8SF2cMF/BpLnGaa0piIT4gn4CXF XT6WsJKeGKBGPGq7RP1tkzRkjleHlHeLRxgNd+YMtadmJRKm5rJ9lbNCWTSVPzDdmgo5 4+LLFvNLH1IwnKnSsC/1m3yaoRv31kLV7iKcAE1rQNvDwXIp70M4S+xTWEAxxUKC3Urk s0Dg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=FnV4aPex; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id l19-20020a170906795300b007a65a87f839si166837ejo.114.2022.10.24.09.07.33; Mon, 24 Oct 2022 09:07:57 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=FnV4aPex; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232190AbiJXQGw (ORCPT + 99 others); Mon, 24 Oct 2022 12:06:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232999AbiJXQEI (ORCPT ); Mon, 24 Oct 2022 12:04:08 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F8EB1E5741; Mon, 24 Oct 2022 07:56:20 -0700 (PDT) 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 ams.source.kernel.org (Postfix) with ESMTPS id 16E45B81689; Mon, 24 Oct 2022 12:25:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 738F6C433C1; Mon, 24 Oct 2022 12:25:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666614352; bh=3P1RuKW+50OYJAFeMcmTfsusDpHOt5nIdo0NuyDhDno=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FnV4aPexrmT/4cg97X5a0nnfmxXcS5Vg4CRm3uKdzSgf7H8p4y6rNYpEQrkbCyrRd xdgk/18bx21MkbSZAZQXRL9AKPgZ1jvS+KQHk2K59a0VfgFWXNZcCgm3xJxzY2Y+G9 up9E8jM4beHns03liDRIzSq6dHEHLjwSflF8oAJM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Michael Kelley , Guoqing Jiang , Saurabh Sengar , Song Liu , Sasha Levin Subject: [PATCH 5.10 229/390] md: Replace snprintf with scnprintf Date: Mon, 24 Oct 2022 13:30:26 +0200 Message-Id: <20221024113032.534421415@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024113022.510008560@linuxfoundation.org> References: <20221024113022.510008560@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 X-Spam-Status: No, score=-7.6 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747585783393225005?= X-GMAIL-MSGID: =?utf-8?q?1747585783393225005?= From: Saurabh Sengar [ Upstream commit 1727fd5015d8f93474148f94e34cda5aa6ad4a43 ] Current code produces a warning as shown below when total characters in the constituent block device names plus the slashes exceeds 200. snprintf() returns the number of characters generated from the given input, which could cause the expression “200 – len” to wrap around to a large positive number. Fix this by using scnprintf() instead, which returns the actual number of characters written into the buffer. [ 1513.267938] ------------[ cut here ]------------ [ 1513.267943] WARNING: CPU: 15 PID: 37247 at /lib/vsprintf.c:2509 vsnprintf+0x2c8/0x510 [ 1513.267944] Modules linked in: [ 1513.267969] CPU: 15 PID: 37247 Comm: mdadm Not tainted 5.4.0-1085-azure #90~18.04.1-Ubuntu [ 1513.267969] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 05/09/2022 [ 1513.267971] RIP: 0010:vsnprintf+0x2c8/0x510 <-snip-> [ 1513.267982] Call Trace: [ 1513.267986] snprintf+0x45/0x70 [ 1513.267990] ? disk_name+0x71/0xa0 [ 1513.267993] dump_zones+0x114/0x240 [raid0] [ 1513.267996] ? _cond_resched+0x19/0x40 [ 1513.267998] raid0_run+0x19e/0x270 [raid0] [ 1513.268000] md_run+0x5e0/0xc50 [ 1513.268003] ? security_capable+0x3f/0x60 [ 1513.268005] do_md_run+0x19/0x110 [ 1513.268006] md_ioctl+0x195e/0x1f90 [ 1513.268007] blkdev_ioctl+0x91f/0x9f0 [ 1513.268010] block_ioctl+0x3d/0x50 [ 1513.268012] do_vfs_ioctl+0xa9/0x640 [ 1513.268014] ? __fput+0x162/0x260 [ 1513.268016] ksys_ioctl+0x75/0x80 [ 1513.268017] __x64_sys_ioctl+0x1a/0x20 [ 1513.268019] do_syscall_64+0x5e/0x200 [ 1513.268021] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: 766038846e875 ("md/raid0: replace printk() with pr_*()") Reviewed-by: Michael Kelley Acked-by: Guoqing Jiang Signed-off-by: Saurabh Sengar Signed-off-by: Song Liu Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/md/raid0.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -48,7 +48,7 @@ static void dump_zones(struct mddev *mdd int len = 0; for (k = 0; k < conf->strip_zone[j].nb_dev; k++) - len += snprintf(line+len, 200-len, "%s%s", k?"/":"", + len += scnprintf(line+len, 200-len, "%s%s", k?"/":"", bdevname(conf->devlist[j*raid_disks + k]->bdev, b)); pr_debug("md: zone%d=[%s]\n", j, line);