From patchwork Tue Mar 31 08:59:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 228572 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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 BF79DC43331 for ; Tue, 31 Mar 2020 09:21:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8C0512072E for ; Tue, 31 Mar 2020 09:21:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585646468; bh=rAT7k9QfL/uRKMskwddcHA1BKZ5ENz8y42pgaEwLH+I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tXrdchm8NND0wqz/bR2QWsvWrtWmKsMEiTaHYUa7QcE5GBmPH0nCPjnGIZPTfU0qs j6eN5Yek4D/sc3qLrZdNTLkkgRVD8OATY9voZK2aY0cVeG0baLb9qzoDzd6f4Wlwoy H1fLeB+HZczWvvJR+R30QFuzXW/lPzSGumoRA3mQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731169AbgCaJKU (ORCPT ); Tue, 31 Mar 2020 05:10:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:53932 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731147AbgCaJKN (ORCPT ); Tue, 31 Mar 2020 05:10:13 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6A34A2072E; Tue, 31 Mar 2020 09:10:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585645812; bh=rAT7k9QfL/uRKMskwddcHA1BKZ5ENz8y42pgaEwLH+I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z09UONIayBqSaGIQp91fFrgOridDgs+gBP12ULhbczpzOXhId9dKt7KXJ7e7tz2ko 3oyS466P7VqXk0Zyn+Rdh8xsGqCmVj5uqdQO720zdTezbqUWEfgvS3bxlVyB6WEjjU 5KuXy7SAqjsnuhxrP0WeRzpOgQpqyfdTEFL/XCVw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter Subject: [PATCH 5.5 157/170] staging: kpc2000: prevent underflow in cpld_reconfigure() Date: Tue, 31 Mar 2020 10:59:31 +0200 Message-Id: <20200331085439.631756439@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200331085423.990189598@linuxfoundation.org> References: <20200331085423.990189598@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dan Carpenter commit 72db61d7d17a475d3cc9de1a7c871d518fcd82f0 upstream. This function should not allow negative values of "wr_val". If negatives are allowed then capping the upper bound at 7 is meaningless. Let's make it unsigned. Fixes: 7dc7967fc39a ("staging: kpc2000: add initial set of Daktronics drivers") Signed-off-by: Dan Carpenter Cc: stable Link: https://lore.kernel.org/r/20200224103325.hrxdnaeqsthplu42@kili.mountain Signed-off-by: Greg Kroah-Hartman --- drivers/staging/kpc2000/kpc2000/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/staging/kpc2000/kpc2000/core.c +++ b/drivers/staging/kpc2000/kpc2000/core.c @@ -110,10 +110,10 @@ static ssize_t cpld_reconfigure(struct d const char *buf, size_t count) { struct kp2000_device *pcard = dev_get_drvdata(dev); - long wr_val; + unsigned long wr_val; int rv; - rv = kstrtol(buf, 0, &wr_val); + rv = kstrtoul(buf, 0, &wr_val); if (rv < 0) return rv; if (wr_val > 7)