From patchwork Thu Jan 18 03:49:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fullway Wang X-Patchwork-Id: 13522355 Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11olkn2010.outbound.protection.outlook.com [40.92.20.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5A9C06104; Thu, 18 Jan 2024 03:49:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.92.20.10 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705549798; cv=fail; b=fvwI6NonB9TBCBZSJ02tEJ4CkEZw+/XhaqRtUBZlwMKmfplsmPaFHQQdEaZlEpaUPCQ6v/hCxr/GGIXJWPP030vrg7wOvnaRjnP5UGR0eGk221xKhLtsxgCoamygUkWntjrQ5S7/22vzyl0UUl29OJ8rjAwzZ5tECeeVucEatTU= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705549798; c=relaxed/simple; bh=9+ZdnMgXSnEftjkAa5qqD0fMwuYy8Nf080YlBAGoChU=; h=ARC-Message-Signature:ARC-Authentication-Results:DKIM-Signature: Received:Received:From:To:Cc:Subject:Date:Message-ID:X-Mailer: Content-Transfer-Encoding:Content-Type:X-TMN:X-ClientProxiedBy: X-Microsoft-Original-Message-ID:MIME-Version: X-MS-Exchange-MessageSentRepresentingType:X-MS-PublicTrafficType: X-MS-TrafficTypeDiagnostic:X-MS-Office365-Filtering-Correlation-Id: X-Microsoft-Antispam:X-Microsoft-Antispam-Message-Info: X-MS-Exchange-AntiSpam-MessageData-ChunkCount: X-MS-Exchange-AntiSpam-MessageData-0:X-OriginatorOrg: X-MS-Exchange-CrossTenant-Network-Message-Id: X-MS-Exchange-CrossTenant-AuthSource: X-MS-Exchange-CrossTenant-AuthAs: X-MS-Exchange-CrossTenant-OriginalArrivalTime: X-MS-Exchange-CrossTenant-FromEntityHeader: X-MS-Exchange-CrossTenant-Id: X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: X-MS-Exchange-Transport-CrossTenantHeadersStamped; b=PdrwPwzmR2Wv4jIJOlL24UmY1z0vgwJoeHA7HDoHWlNKU/NBUqk8DxakNuz3IZSH6QAXUxFMjLzB+AytLk/Z5DM4JWwuvmXjnOxZZewwqIjpkzweeVGYy1I3DNqb8vf5WtcZHhVDgYt0eeIFBuJ3EE2vzX0vN1+wRROJB3Z0omc= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=outlook.com; spf=pass smtp.mailfrom=outlook.com; dkim=pass (2048-bit key) header.d=outlook.com header.i=@outlook.com header.b=Ffu1MIeq; arc=fail smtp.client-ip=40.92.20.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=outlook.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=outlook.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=outlook.com header.i=@outlook.com header.b="Ffu1MIeq" ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=bz4wypkxoj34g5QrkpTi0OZlmX8MkABuZcyOqKcQwWaQWewaCp3Gw3pO3ra4vKoroJxOnhNOmghhfz3pb6+N34eqO4Qg4Ovd/r5LjvWyKwZDCqe2cJK2XYE7T6LrZEitD3WdZ0zu/2rHGJENmY07JJIIy6ARHvStq6FfOt0YaNZM4leUedhvskJmqbskSVVguIYBvwKN1GZDC0Fxh0dble7P2KC51aK+yt7LSZECC2C/DbjnfZzKRIu58K4F8WjnZbnQvD48jPRkzv/PIcrfCAbiLrtXqAQGFg+H1Pox5DnTCoporbKHoPw7RytGjsfDAu0+/H4yqi8VmFPE9B43Jg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=sK/10QuoOSOznME75OArl9avCk+48frXCoSRNUxVpkA=; b=ZeIdo9+Jb93ABEcjF2EWgCRdMpcWlZmZ+2kEmWS8kyJT4xtQNnA+mDIImiNWZPLERJ1Ze/RgbPkRVkopVegiV3J+9IwFJHPg4A3oHBGyySUbFNO0l8fF+/39eqvcXKrAfznOzeYoTWIlAtWlFSPPlAE3plL5wXgZglstFTeIgOizKg6dLnGu6T8FzU+A2NRWxk0v4SQSSN/gpcDzxh1IpVT4UbKtsQJUaDBOy+pci1z8pDN2lB5QbrrvvhObuHSe7LElrHY1lvvhvCrxpI19OxYFvubpEWcRaIBWb7V4ArOp+MdkeIURECchrUJ+WjyIaAUsfw8ea8UJdjFFa3uPjA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none; dmarc=none; dkim=none; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=outlook.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=sK/10QuoOSOznME75OArl9avCk+48frXCoSRNUxVpkA=; b=Ffu1MIeq1Wd4yYsFyoz62AR6df1wNQ4vfOoMBpKsqBTYd/o7wTz8FwC75suQgS8G6Js6UnN8+2IyLPcaP/8FaAYrudXSVo7TXRnflEfqus3QvXJspZz8icNItXpC8NlM5c0PLZGF1MYTx2fPclOz9Mr6x1LGhB3Xdn/CVVp1AyPxQHcxKuVOluGPVShLWNMCND5J3f3ofO1fiK1hO2Dyy6LeXbFtxVoVgmiHzEgfy2ODV7LUPS/TLYrT1cmA5qYxsyu+FxvdhaAFfMhqvoGyZOYVKVrDE0ikk3J0E585sRSLbGM1d/287K3G+AQI4Mb/Yv0y1Jnypko7qHQxzo8OpA== Received: from PH7PR20MB5925.namprd20.prod.outlook.com (2603:10b6:510:27f::21) by CY5PR20MB4796.namprd20.prod.outlook.com (2603:10b6:930:24::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7202.23; Thu, 18 Jan 2024 03:49:54 +0000 Received: from PH7PR20MB5925.namprd20.prod.outlook.com ([fe80::e1de:29a8:e090:5b7b]) by PH7PR20MB5925.namprd20.prod.outlook.com ([fe80::e1de:29a8:e090:5b7b%4]) with mapi id 15.20.7202.020; Thu, 18 Jan 2024 03:49:54 +0000 From: Fullway Wang To: adaplas@gmail.com, deller@gmx.de Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, fullwaywang@tencent.com, Fullway Wang Subject: [PATCH] video: fbdev: savage: Error out if pixclock equals zero Date: Thu, 18 Jan 2024 11:49:40 +0800 Message-ID: X-Mailer: git-send-email 2.39.3 (Apple Git-145) X-TMN: [he3cprEfCXhaGCQcnpqyKaMLVOheYFqg] X-ClientProxiedBy: SI2PR02CA0044.apcprd02.prod.outlook.com (2603:1096:4:196::17) To PH7PR20MB5925.namprd20.prod.outlook.com (2603:10b6:510:27f::21) X-Microsoft-Original-Message-ID: <20240118034940.20683-1-fullwaywang@outlook.com> Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH7PR20MB5925:EE_|CY5PR20MB4796:EE_ X-MS-Office365-Filtering-Correlation-Id: fbac9a61-6f28-44f9-2305-08dc17d887c7 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: fbac9a61-6f28-44f9-2305-08dc17d887c7 X-MS-Exchange-CrossTenant-AuthSource: PH7PR20MB5925.namprd20.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jan 2024 03:49:54.2490 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR20MB4796 The userspace program could pass any values to the driver through ioctl() interface. If the driver doesn't check the value of pixclock, it may cause divide-by-zero error. Although pixclock is checked in savagefb_decode_var(), but it is not checked properly in savagefb_probe(). Fix this by checking whether pixclock is zero in the function savagefb_check_var() before info->var.pixclock is used as the divisor. This is similar to CVE-2022-3061 in i740fb which was fixed by commit 15cf0b8. Signed-off-by: Fullway Wang --- drivers/video/fbdev/savage/savagefb_driver.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/video/fbdev/savage/savagefb_driver.c b/drivers/video/fbdev/savage/savagefb_driver.c index dddd6afcb972..ebc9aeffdde7 100644 --- a/drivers/video/fbdev/savage/savagefb_driver.c +++ b/drivers/video/fbdev/savage/savagefb_driver.c @@ -869,6 +869,9 @@ static int savagefb_check_var(struct fb_var_screeninfo *var, DBG("savagefb_check_var"); + if (!var->pixclock) + return -EINVAL; + var->transp.offset = 0; var->transp.length = 0; switch (var->bits_per_pixel) {