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 328D4C43334 for ; Wed, 6 Jul 2022 15:03:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232420AbiGFPDE (ORCPT ); Wed, 6 Jul 2022 11:03:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49010 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231690AbiGFPDD (ORCPT ); Wed, 6 Jul 2022 11:03:03 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.17.22]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D5B1D25EB8 for ; Wed, 6 Jul 2022 08:03:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1657119774; bh=rQmS4yIj+Kq0oK+U8Ryv32tYGBvhOaSYofJZQWpZKAg=; h=X-UI-Sender-Class:From:To:Subject:Date:In-Reply-To:References; b=A+/0m88zrK6qAQaR6+7pIQQl2Y215QcZPWHe5boyZ6Uhh+WC4eQ2EXGwf5SD8EUbg 5SHbuFc8RvoYxZDVF9JPNNFhmJY3Mr0iD9tfzKXpizWlPT02sT+fve+82Inr4SnfnJ 34kkCRR2Q4Iqe7aMHbXrO+z/duaEFoOP+0D00XDE= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from p100.fritz.box ([92.116.134.81]) by mail.gmx.net (mrgmx105 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MrhUK-1nlqck3BAq-00nfeK; Wed, 06 Jul 2022 17:02:54 +0200 From: Helge Deller To: linux-fbdev@vger.kernel.org, daniel.vetter@ffwll.ch, dri-devel@lists.freedesktop.org, geert@linux-m68k.org Subject: [PATCH v3 1/4] fbcon: Disallow setting font bigger than screen size Date: Wed, 6 Jul 2022 17:02:50 +0200 Message-Id: <20220706150253.2186-2-deller@gmx.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220706150253.2186-1-deller@gmx.de> References: <20220706150253.2186-1-deller@gmx.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:oShNuyil0feMp05hW2usMgSVD8rYb4p7RsxBj5uoROaM4CEahi2 ObJSydSfqHH9gpBYSMpoHZ81lxTTlZXIjj0QZfiBnOClixGqysk4XfH8A4kkjFRuwddzltb cPCfeTRJpdMCW8dKifc/BTiW06FhPKOj14TaOZbN9OGVaBi4pCrTuEovbV0iAuoPZh4WH31 MuFku7YedEI6j0GwQRnLQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:inpeYIvy66s=:wOGmewbp7/ITwMjRoMhaDq UYND07/RmKGB/2fbsIeNJ29LYTpM9Bf2AIEcuTJPCkXITcAUaFcA4Zos68L+oKO/NylOr9ydm EKcmYClfpLatQ4kEnq0gP7CWqOCs0cKtGi+96i1+vCqzj8zzNM/MvVLY0L6Fnyklswk2seDzg d15rkIFG1SmkMFqTrGxlLJEDx83kZgb4JKNs2TZC/gNqdm5I1G7+nl9E/Tmkq2MYfBWZtfy4l yw5Tn9XMLdBejacOktrsw4k9eeAGAdNv2LLS2c/VrVrNdKz0nYyn5wziYQGsWLB2SW5UNc9X7 NFb0JdFg6DZPlmYdoaGNVXHeJ0JsRCsSNtLUl+Yv07viH08LaqOxVHMHqWrnCdWLCSAOxlfQf JORWtQIWLehGCdw3vaEthVcLH3ZeGZVttaJt2rHlz+yW1kUv4OkLdecWLibpO7h42CNa3bE0k auOffFoZ+LsQTSVufg6xvYB9v2283lL8hcrt7NVu6L0rdtTlvVEaxPAPbimBB03ATme95KP5Y wpzGlm0qzJlyhH37BGt1P5QEoJZn9DCVi8dFVFcaMoVeSdFQubF2HOW0aJ2MWOg7rbk395Cq+ ocWoHyA1izw/VFzVAbXIWKdWNKNTh5PyWXUgsdw9y1J10d85KtwgptY8MVp3XW1mKnbeFB+u3 VsN/z6t+OxN7uE6BRup3GdxxhuNPDQeHmLu7h8pgRRS/mYWq2tuwDLWNmI6zP0O2+vhp97JlB xUw/DTfqMkTWl3Ej2sYwUdv91PqexzmLNUuBipXInzdwEy7WWV5o2QPw4YFQm4G3pQaQL5KQw M6mqwkQdbKLVssEOc6BWRpLKAV2ysGTbNXnvbjyrzABmnJ+7XJmWQ2ZInmnqblFpXISv5CnNz Mxw9g5lHVZclRYO46rqiTa7seDse0mBj3v41Pij1e/YWeT3vb6JdU7hIW8lKUBa2GgC2cw0tI WIp9KaJwhZ84tXMk4HkF0+9OOm7BH2xSvtWM/jvanQvG1HvTBc0PMLSMYAIXccKUYc4idGFTL IqwJdS5Vw5Hc29K3oSjOLY+rCIx+by/gyi71fXT88BDwTMSyZAoIAq39LiEu5wg1KKMxWFxSw Yt9lZzmxhcyOa48XBm0qOL4Ax222IOG3wz/CC/UcHSQIFe/FoyptyEZtA== Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Prevent that users set a font size which is bigger than the physical scree= n. It's unlikely this may happen (because screens are usually much larger tha= n the fonts and each font char is limited to 32x32 pixels), but it may happen on smaller screens/LCD displays. Signed-off-by: Helge Deller Reviewed-by: Daniel Vetter Reviewed-by: Geert Uytterhoeven Cc: stable@vger.kernel.org # v4.14+ =2D-- drivers/video/fbdev/core/fbcon.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/f= bcon.c index c4e91715ef00..a33532564393 100644 =2D-- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -2469,6 +2469,11 @@ static int fbcon_set_font(struct vc_data *vc, struc= t console_font *font, if (charcount !=3D 256 && charcount !=3D 512) return -EINVAL; + /* font bigger than screen resolution ? */ + if (w > FBCON_SWAP(info->var.rotate, info->var.xres, info->var.yres) || + h > FBCON_SWAP(info->var.rotate, info->var.yres, info->var.xres)) + return -EINVAL; + /* Make sure drawing engine can handle the font */ if (!(info->pixmap.blit_x & (1 << (font->width - 1))) || !(info->pixmap.blit_y & (1 << (font->height - 1)))) =2D- 2.35.3