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 41D5AC6FD1C for ; Wed, 22 Mar 2023 20:19:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232225AbjCVUTU (ORCPT ); Wed, 22 Mar 2023 16:19:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58352 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232221AbjCVUTE (ORCPT ); Wed, 22 Mar 2023 16:19:04 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EA64D97B59; Wed, 22 Mar 2023 13:09:05 -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 C9CE9622D7; Wed, 22 Mar 2023 20:03:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 76B20C433D2; Wed, 22 Mar 2023 20:03:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1679515382; bh=K0x3SRRa4HXHn+EKwSF6/erKOQgcKi+VGbc7NR6slpo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=masvDieUHSlaDB2/gVBMpy7mcvvHSAvwBKMt3rtOQZNXjElhDYFfwdxNGTDPcSIBy AuBxyohL83isMoLa89TxH8eeo8Ivf8z1AC5yQqQDyizdNw4NpvkxDArqeFJmyhHfjI ebN11+zxTxfCYqyMUMsnKIWc0NrFJ28bsGybYfwkA3fBG+VI8uix+iMSpTbmjbLeye OoQffzh0mvROvD89A+XkgZbkW9AudibT+I66ybA4bhIgYR46Qnr7o1HnVZR+W9Ihv0 amiaUNTCG/6bWX4/NtWve3AM+Qi3OjfhcATKi30bEDk5QitwWXhWNnIUQDxWG/fSVX go1eFYn70zaKA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Wei Chen , Helge Deller , Sasha Levin , adaplas@gmail.com, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.4 6/9] fbdev: nvidia: Fix potential divide by zero Date: Wed, 22 Mar 2023 16:02:38 -0400 Message-Id: <20230322200242.1997527-6-sashal@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230322200242.1997527-1-sashal@kernel.org> References: <20230322200242.1997527-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org From: Wei Chen [ Upstream commit 92e2a00f2987483e1f9253625828622edd442e61 ] variable var->pixclock can be set by user. In case it equals to zero, divide by zero would occur in nvidiafb_set_par. Similar crashes have happened in other fbdev drivers. There is no check and modification on var->pixclock along the call chain to nvidia_check_var and nvidiafb_set_par. We believe it could also be triggered in driver nvidia from user site. Signed-off-by: Wei Chen Signed-off-by: Helge Deller Signed-off-by: Sasha Levin --- drivers/video/fbdev/nvidia/nvidia.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/video/fbdev/nvidia/nvidia.c b/drivers/video/fbdev/nvidia/nvidia.c index fbeeed5afe350..aa502b3ba25ae 100644 --- a/drivers/video/fbdev/nvidia/nvidia.c +++ b/drivers/video/fbdev/nvidia/nvidia.c @@ -766,6 +766,8 @@ static int nvidiafb_check_var(struct fb_var_screeninfo *var, int pitch, err = 0; NVTRACE_ENTER(); + if (!var->pixclock) + return -EINVAL; var->transp.offset = 0; var->transp.length = 0; -- 2.39.2