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 B049DC433EF for ; Sat, 25 Jun 2022 22:06:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233382AbiFYWGl (ORCPT ); Sat, 25 Jun 2022 18:06:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233356AbiFYWGk (ORCPT ); Sat, 25 Jun 2022 18:06:40 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B8F37120BD for ; Sat, 25 Jun 2022 15:06:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1656194792; bh=tRqvkgP3s46IORRaOk1LZP5YQEeJ21rrrTXuUbKXSvE=; h=X-UI-Sender-Class:From:To:Subject:Date:In-Reply-To:References; b=gVrFVJYj453sz98YflohNPOOQQZbth+K4YFhG9lefmk3XNgvdwmbNO/qJOp/qshBy kKrZkP+3H/DHYdhbbt3W5Aq3QGYdGYjO8kHn9HCVPHInPZL5BUwZgtHbe7OVImVsP3 LwCHAYn2QW5Y8wrvSY472rwPWkRUmSJ5HPL0Oa6c= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from p100.fritz.box ([92.116.162.44]) by mail.gmx.net (mrgmx105 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MrhUK-1nHdUB3Cdg-00nhHD; Sun, 26 Jun 2022 00:06:31 +0200 From: Helge Deller To: dri-devel@lists.freedesktop.org, daniel.vetter@ffwll.ch, linux-fbdev@vger.kernel.org Subject: [PATCH v3 1/4] fbcon: Disallow setting font bigger than screen size Date: Sun, 26 Jun 2022 00:06:27 +0200 Message-Id: <20220625220630.333705-2-deller@gmx.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220625220630.333705-1-deller@gmx.de> References: <20220625220630.333705-1-deller@gmx.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:FGIQ5xSaIVRGo4hp8yfX3n+NH29eA3bhr7z5zE4g+f3T5zRqYbJ zfitv+gynLV+29UqzuD1omCeWLTjBxw3URRCUruG5beTTpJwXPSVyPGU9rl9k3f2v72L3YI ryOvAP3NCpjrN2RbMJt1xe+4aqFrnRycUYXdJ1KpiKh4qTzCO0WNokFjJKttABzePmx0kau cYv3wRkBoZHFh0ifKVO5g== X-UI-Out-Filterresults: notjunk:1;V03:K0:w5twWS2oZ94=:TVJNx05VlhXQr756TbEvcH pouTt5mAlmU6YoVEz8v+dt1aKBllFcVDxvL2FoCtP4AgZlSn+SBDAKdmm90iKmZC7YwxWJav/ ga0hpPkd4loszDLRNTpUV1Q44Sr2Oe6Nn6LVs5E8qgLqIojTL/a1ZwA/kuJtUsypavAZgDFSH Hb6uo+Oj+chyHpfFJsyfTwoJ9K8ILT01UDcYxgtn1HYpfIIu2lA2qzyJkxBklplLlTc5O9li2 +uj6OELsF4RsoefT5FA4tUGuohvzEghHNTm8Eq7TldqacUUYTZDNg000EvPj7Khihi9QQ/UsR 3qhqqWRYxtp8whXauCQxsN6uUIghz+Ay5V9vlaXFJI+vbQ0s8q3Ht77kIWqamkr58e3RA5qVQ xTdEEiyFF5yqGvjREyJH4BLdDVkZw29TlNlMzmkHQk8P9E3DhLmAtIU38NM78V4bMagB2DU0y oEELu9hg8IopMVF/s9MPWnUJImwfCbHfvBUqsNvc4Q0Zta7xtvIlKIxKmZpPZTmD+NhMCDbRa 7MOnV0RQT642bmCJziLpWnEIbG2UDrkghWKQ/MhM18PJYriT7Q416Mi05khoi8WGoJe1XyfmQ zYK+aVAJDUuhDbaBU0kjy7/4FBoJEHgw6aT5/9VI/BiX0nSRxyEVMo87IgasA56agYJps+JXb yqXZVm6KAz0iOBjdYfqLHb+PGIuXcA8IKMaZ8YxLsN62FWr4QA29LfY9Nh9fcVJKySsDz5iw4 bTJ/8meRbQmO/FBmDYCcwhgxLEmoML8mmuekDSFiqki++zYxvDC/XUOld6A7A5aF4jjWATPoi OsrxpdFOOdwhugxigOE8rki1lZr1l7mBtZhQ+lufAApndehjsMgrHVv97vLyqjs9FCKmOo6YI W2wk+BMRagJM3BHLtUWcDs42Q3X5joVm1KQB/tO4zrSJdujk1DuJf0Gv0cq6qsTtbOF/m5Z67 bX7o8O2pgAfPcMNRU6r1l3We/nIgQ6YkRK6v8vc+UTaQhrY0GaFJjprfpLke7uqn4mIJ+JCPq JErl0QabZmvWlApkRbWBU2vkvc79uq8snDb1GUULgToAh1m8jJ/K/MauJLFCwNT+q7W+F08hc f0Cep3ceI5X6zfcHS6z3YDia0IrsruF4SFxQgpBcXA4CaSHwQfKCDkyyQ== 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 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..e162d5e753e5 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 (font->width > FBCON_SWAP(info->var.rotate, info->var.xres, info->va= r.yres) || + font->height > FBCON_SWAP(info->var.rotate, info->var.yres, info->va= r.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