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 65E0EC7619A for ; Wed, 22 Mar 2023 20:23:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232285AbjCVUX4 (ORCPT ); Wed, 22 Mar 2023 16:23:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46024 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232091AbjCVUXg (ORCPT ); Wed, 22 Mar 2023 16:23:36 -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 A89CD6C6BE; Wed, 22 Mar 2023 13:13:37 -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 C73C262276; Wed, 22 Mar 2023 20:03:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74D56C4339B; Wed, 22 Mar 2023 20:03:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1679515410; bh=95OnjUFgts2qjKb/jFfpXjpPJsfmbkMLtlubSbuSs1A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I3K/RAPwgCfDuZqeScEF80rPPnP4YEysscW2oALp/PVTEFPDuXsNFb4VgQgiHexLT EBUPWu0Fd+GsyWtuWiGSTUHFPamisB59TO7zu6tK0Lfsq1bRQRZzPZ6L9LsUROdfZc tZpThb6sxGr4XgoowdILI1tKgXyhsPj6m7ICgPS8Wy5Pf5A/yzw0lmH19rPRNflDqE dqUnnQ4KzAPOU0VRCVzcb7/EJO3Y1nnS4SHT35OLzR4fNSKhKwBdksv68k3uiMOvNd OQenaFCVoGgMP5PgBcSX7zqSVWrC7aRhrLyNvJXgMxWEwlAxN5+CcOiMvOCJDsiuOZ ox4iTDIYakamw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Wei Chen , Helge Deller , Sasha Levin , mbroemme@libmpq.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 4.19 7/9] fbdev: intelfb: Fix potential divide by zero Date: Wed, 22 Mar 2023 16:03:07 -0400 Message-Id: <20230322200309.1997651-7-sashal@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230322200309.1997651-1-sashal@kernel.org> References: <20230322200309.1997651-1-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-kernel@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