From patchwork Mon Oct 8 21:24:51 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 10631469 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1746313BB for ; Mon, 8 Oct 2018 21:24:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 00F7F29D18 for ; Mon, 8 Oct 2018 21:24:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E964B29D1B; Mon, 8 Oct 2018 21:24:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9D8B529D18 for ; Mon, 8 Oct 2018 21:24:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725828AbeJIEil (ORCPT ); Tue, 9 Oct 2018 00:38:41 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:35848 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725749AbeJIEil (ORCPT ); Tue, 9 Oct 2018 00:38:41 -0400 Received: by mail-pg1-f193.google.com with SMTP id f18-v6so8395207pgv.3; Mon, 08 Oct 2018 14:24:58 -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; bh=DB4mJC99RCSb06yHhTFT6Rx07Rhf2NMq1wxxXxOGDAo=; b=A4NgBOHkD8DKyb+DaAmu7gYwHGK+wgk3gSOoDObfilp6C9KePBALj3OqcO9dKBV8wj bNDCyZgX7Z2Ol4kXlYHDInRj3EuOB/qpR/NGug1Cho7mcExhplH+ku0k5tl7OqxTk95z CSRTdJO4Tv5ZObR/x9iYythCGmsnNTpYdrzA9wlkVOlbKlCkHx6uU5BIfnizMO1sY2nJ yGpU4Xr9P7Geb/XpHyR1putzU8+1UWkt22n5NVptu1idKJSXMhJGEUiQ6B6D9+8SfL56 StfKFYGh3ou7NDLxQB77Kq+laFH/HNrwQKwXSEQkPCoSaoU6DYmHrFndX0gm5XOtIetY 2krA== 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; bh=DB4mJC99RCSb06yHhTFT6Rx07Rhf2NMq1wxxXxOGDAo=; b=rVcSfFT7ALnmCX+tE8dRHAOM3AjgV9EOvgWs5GTR8fBbzD2Gk8sq7xGzPpvb+DbIhN XKI+G5v38UbF7sYya13Jd1T8nHTxIjR7LUlEtPBdaV2ws2jwmbCOzC0C2jxBqRNBLcl7 Bq0izxy+Df9GYWBNm4Ou74IAtcj1RsiQ9a01M4E2Nri1EDjc1VxRpY2J71iJpQ37NmHe YQGE7bOKfgwmgmOQMsTAwOm5/o9bdw6oq7mIZ23lAb6R4X0doUU4DVPrOFl7cyXyaYmC AlbRoSI4IBkLwI9BnGTQMetpmxE5ZqjqOno53KdljdYr2LtSGKLWtMf38HBFbrWHVLMM dy4A== X-Gm-Message-State: ABuFfogVQ4fNDS2wqf3PpUBOl+1nvwrbG3zz8qEcScHEWL9C/TSnndIW nd8yZqrNcb8korVcvz643oob0+aC X-Google-Smtp-Source: ACcGV60KkRWTJQFK8RNd92Fy7o8ocCx2vDVFR9Jll7rj1AxS/NncDPMJeF5qSQqFC6GA/IKW7jn1QA== X-Received: by 2002:a62:b87:: with SMTP id 7-v6mr26927995pfl.67.1539033897455; Mon, 08 Oct 2018 14:24:57 -0700 (PDT) Received: from Asurada-Nvidia.nvidia.com (thunderhill.nvidia.com. [216.228.112.22]) by smtp.gmail.com with ESMTPSA id j187-v6sm30530413pfc.39.2018.10.08.14.24.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 08 Oct 2018 14:24:56 -0700 (PDT) From: Nicolin Chen To: jdelvare@suse.com, linux@roeck-us.net Cc: afd@ti.com, linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] hwmon: (ina3221) Validate shunt resistor value from DT Date: Mon, 8 Oct 2018 14:24:51 -0700 Message-Id: <20181008212451.18637-1-nicoleotsuka@gmail.com> X-Mailer: git-send-email 2.17.1 Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The input->shunt_resistor is int type while the value from DT is unsigned int. Meanwhile, a divide-by-zero error would happen if the value is 0. So this patch just simply validates the value. Signed-off-by: Nicolin Chen --- Changelog v1->v2: * Validate the value and error out drivers/hwmon/ina3221.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c index c3a497aed345..4f3ed24efe8e 100644 --- a/drivers/hwmon/ina3221.c +++ b/drivers/hwmon/ina3221.c @@ -536,8 +536,14 @@ static int ina3221_probe_child_from_dt(struct device *dev, of_property_read_string(child, "label", &input->label); /* Overwrite default shunt resistor value optionally */ - if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val)) + if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val)) { + if (val < 1 || val > INT_MAX) { + dev_err(dev, "invalid shunt resistor value %u of %s\n", + val, child->name); + return -EINVAL; + } input->shunt_resistor = val; + } return 0; }