From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 54A46C761AF for ; Mon, 3 Apr 2023 14:21:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233072AbjDCOVn (ORCPT ); Mon, 3 Apr 2023 10:21:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42182 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232978AbjDCOVk (ORCPT ); Mon, 3 Apr 2023 10:21:40 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 145912D7FE for ; Mon, 3 Apr 2023 07:21:20 -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 sin.source.kernel.org (Postfix) with ESMTPS id BE186CE0FE2 for ; Mon, 3 Apr 2023 14:21:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9E6BC433D2; Mon, 3 Apr 2023 14:21:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680531675; bh=hkwxSZAe/lfznY7v5/uJEgJ4zJ8deckhDUkg6dhdkHM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KlncHoqG76F3HqG7ogfxYNG/GcyE8Q0RyGChXlRlqKXZR1nvQa5dZuhWZibCRA2Tn 6I1SsoOkWWyZnsdh7lCNid0ftWPR9+iOCgiSWO40JtrjHVK3wqUMBWivQ/Og+sd/Eh /LlZYkNTpGaPu7zdOae0H8VntiMJpdaHXZQoszdw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Wei Chen , Helge Deller , Sasha Levin Subject: [PATCH 5.4 069/104] fbdev: lxfb: Fix potential divide by zero Date: Mon, 3 Apr 2023 16:09:01 +0200 Message-Id: <20230403140406.896554819@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140403.549815164@linuxfoundation.org> References: <20230403140403.549815164@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Wei Chen [ Upstream commit 61ac4b86a4c047c20d5cb423ddd87496f14d9868 ] var->pixclock can be assigned to zero by user. Without proper check, divide by zero would occur in lx_set_clock. Error out if var->pixclock is zero. Signed-off-by: Wei Chen Signed-off-by: Helge Deller Signed-off-by: Sasha Levin --- drivers/video/fbdev/geode/lxfb_core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/video/fbdev/geode/lxfb_core.c b/drivers/video/fbdev/geode/lxfb_core.c index b0f07d676eb3e..ffda25089e2ce 100644 --- a/drivers/video/fbdev/geode/lxfb_core.c +++ b/drivers/video/fbdev/geode/lxfb_core.c @@ -234,6 +234,9 @@ static void get_modedb(struct fb_videomode **modedb, unsigned int *size) static int lxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { + if (!var->pixclock) + return -EINVAL; + if (var->xres > 1920 || var->yres > 1440) return -EINVAL; -- 2.39.2