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 10A3BC77B6C for ; Mon, 3 Apr 2023 14:17:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232968AbjDCORI (ORCPT ); Mon, 3 Apr 2023 10:17:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232960AbjDCORH (ORCPT ); Mon, 3 Apr 2023 10:17:07 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 080B327831 for ; Mon, 3 Apr 2023 07:17:07 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 95BCA61CD1 for ; Mon, 3 Apr 2023 14:17:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A69E7C433EF; Mon, 3 Apr 2023 14:17:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680531426; bh=95OnjUFgts2qjKb/jFfpXjpPJsfmbkMLtlubSbuSs1A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=me0O4lqhYwfPKMHGMjmqzwcaPxOad5dLrvMOX8DN3fZ3shsKSSwq66UbayQKJFN5N YrBa3MfpX4AS/XjxffMBoGGuQB1SpuE/GuEZ/Uiodyn/Ec8hH4kYHrZ7SJ0DKkwV1P nfsQjbUTeqLe9deq99HPJsESoW0Qae50fyNXpSNs= 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 4.19 58/84] fbdev: intelfb: Fix potential divide by zero Date: Mon, 3 Apr 2023 16:08:59 +0200 Message-Id: <20230403140355.420772326@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140353.406927418@linuxfoundation.org> References: <20230403140353.406927418@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 d823685486a3446d061fed7c7d2f80af984f119a ] Variable var->pixclock is controlled by user and can be assigned to zero. Without proper check, divide by zero would occur in intelfbhw_validate_mode and intelfbhw_mode_to_hw. 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/intelfb/intelfbdrv.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/video/fbdev/intelfb/intelfbdrv.c b/drivers/video/fbdev/intelfb/intelfbdrv.c index d7463a2a5d83f..c97c0c8514809 100644 --- a/drivers/video/fbdev/intelfb/intelfbdrv.c +++ b/drivers/video/fbdev/intelfb/intelfbdrv.c @@ -1215,6 +1215,9 @@ static int intelfb_check_var(struct fb_var_screeninfo *var, dinfo = GET_DINFO(info); + if (!var->pixclock) + return -EINVAL; + /* update the pitch */ if (intelfbhw_validate_mode(dinfo, var) != 0) return -EINVAL; -- 2.39.2