From patchwork Wed Jun 3 09:19:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bean Huo X-Patchwork-Id: 11585391 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4010C1392 for ; Wed, 3 Jun 2020 09:20:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 279E52074B for ; Wed, 3 Jun 2020 09:20:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="IoM4ng/2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726905AbgFCJUh (ORCPT ); Wed, 3 Jun 2020 05:20:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36438 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726844AbgFCJUV (ORCPT ); Wed, 3 Jun 2020 05:20:21 -0400 Received: from mail-ed1-x542.google.com (mail-ed1-x542.google.com [IPv6:2a00:1450:4864:20::542]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08A9BC05BD43; Wed, 3 Jun 2020 02:20:21 -0700 (PDT) Received: by mail-ed1-x542.google.com with SMTP id p18so1129577eds.7; Wed, 03 Jun 2020 02:20:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=ogVBeLIbUp0NMkbqjh+n5vv4JgRPcqvKmVHALzkoaQM=; b=IoM4ng/2v4WolN9uZtbOyJkSTfaNDpUzdLNwJPJ7EEKEQ92PdmqGo+13pEWhiU7p3X Cvj/WbgwtrXXsCWCkA77HlsqEsXxKWmzIo0B63myw02OK1Z6ekb9L/LnKiiPrwAKEOno D5fmihdWZm1yzhm9xYK/bHOXmTKZ5QEgv/e2DNzqhadtEA0E7q7Tpl4OP0T4gtiChPmw 3ifSz7QAjPXiYDsxcH7dgYbuJl93t6OEsuoa8TVJ3s5fmZEy8E7sn98SvMqUii3Lu+zL vlLv0e7+luboBunXbQa6NVJSGvJ0KE+0cdhvWXl2Jt3vXJC3uWb8yHvutFH2T0nFIUza nh3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=ogVBeLIbUp0NMkbqjh+n5vv4JgRPcqvKmVHALzkoaQM=; b=fD6s2LNVL4dFfHkNZ6ZdJzRfXNXzTmMUdX76PWiTWDfDJI+/jJZJpFd3abNSEECIM/ ohsssE8Gv5eW2n51yMSRX1Zw0C9IHSjp0ZM7Lu3S62LHId/Lcgv0SHfz8JcvWgvgw9EC HQJRTWQsHLCc+1Gl0dFWApMEzN8iOAopUjtPuTQkRRNsc1x9xDWkYnzHZ05UcoNxPW3K DmtRfb83VlLSeEQ9WrOp2dbnrIdfJAouquyYLE14I2rIcX1rfa/UX3OOhsEob/uLcTsy G1e/5AFkHe34tvBYWBiYIfIwzoLMDWeb/hSNhNOCvgDZKtmvCLJ8/8OY5gA8bMbooIN4 Ybag== X-Gm-Message-State: AOAM533Ll/fbSi/NRz8jDmFZyzYbkBpAoLUbz6byrYH95d8CN0j9yMCy mPgdGcju88faGkxMNvGcCPQ= X-Google-Smtp-Source: ABdhPJzXDCE/8Q8sDevWCrnJ5C9NHj2GgnTLW1qURMiMirBoCgNM5FUphb55fmon7SVn5LwHowXCmA== X-Received: by 2002:aa7:d79a:: with SMTP id s26mr28799189edq.202.1591176019739; Wed, 03 Jun 2020 02:20:19 -0700 (PDT) Received: from localhost.localdomain ([2a01:598:d00c:464c:92b:aecc:3637:dc7c]) by smtp.gmail.com with ESMTPSA id 64sm865636eda.85.2020.06.03.02.20.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jun 2020 02:20:19 -0700 (PDT) From: Bean Huo To: alim.akhtar@samsung.com, avri.altman@wdc.com, asutoshd@codeaurora.org, jejb@linux.ibm.com, martin.petersen@oracle.com, stanley.chu@mediatek.com, beanhuo@micron.com, bvanassche@acm.org, tomas.winkler@intel.com, cang@codeaurora.org Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, beanhuo@outlook.com Subject: [RESENT PATCH v5 3/5] scsi: ufs: fix potential access NULL pointer while memcpy Date: Wed, 3 Jun 2020 11:19:57 +0200 Message-Id: <20200603091959.27618-4-huobean@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200603091959.27618-1-huobean@gmail.com> References: <20200603091959.27618-1-huobean@gmail.com> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Bean Huo If param_offset is not 0, the memcpy length shouldn't be the true descriptor length. Signed-off-by: Bean Huo --- drivers/scsi/ufs/ufshcd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index c18c2aadbe14..7163b268ed0b 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -3210,8 +3210,8 @@ int ufshcd_read_desc_param(struct ufs_hba *hba, } /* Check wherher we will not copy more data, than available */ - if (is_kmalloc && param_size > buff_len) - param_size = buff_len; + if (is_kmalloc && (param_offset + param_size) > buff_len) + param_size = buff_len - param_offset; if (is_kmalloc) memcpy(param_read_buf, &desc_buf[param_offset], param_size);