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 B760CCCA47E for ; Sun, 26 Jun 2022 08:56:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229829AbiFZI4Y (ORCPT ); Sun, 26 Jun 2022 04:56:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39420 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230085AbiFZI4X (ORCPT ); Sun, 26 Jun 2022 04:56:23 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1769A11A24 for ; Sun, 26 Jun 2022 01:56:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1656233776; bh=tRqvkgP3s46IORRaOk1LZP5YQEeJ21rrrTXuUbKXSvE=; h=X-UI-Sender-Class:From:To:Subject:Date:In-Reply-To:References; b=U59A+IlQq9Ty2vLJ/t0baMBfoAbH0Aw6B73DmM0bpc00v/3DEX+XtgPUaJ70pgGoD ++kQQ9/7ftC4DTGLMHuoo0T13IJgBEcc4b+xQYiGtn+dSvqUvpy/i8NKOWF5IuTXt/ Fzd+F4UhmCtlKvF7o+tnh1sytaWxHdsXxvufsYeg= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from p100.fritz.box ([92.116.135.166]) by mail.gmx.net (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MA7GS-1nuxfG1bNC-00BbjA; Sun, 26 Jun 2022 10:56:16 +0200 From: Helge Deller To: dri-devel@lists.freedesktop.org, daniel.vetter@ffwll.ch, linux-fbdev@vger.kernel.org Subject: [PATCH v5 1/4] fbcon: Disallow setting font bigger than screen size Date: Sun, 26 Jun 2022 10:56:12 +0200 Message-Id: <20220626085615.53728-2-deller@gmx.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220626085615.53728-1-deller@gmx.de> References: <20220626085615.53728-1-deller@gmx.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:XxMXRHHOIZppOQ33AhPRekjS6DT7v6+OWNQhGg85ofI81pYJvJo oARhDCTnuKL+YZBg7K2qs/zaZo8md8P0mag1Um870odqh/X2cvpKiEJxhRCE+3JmDhpCiAW bM7sTM6JuxBd3ox7kIvcLQPXJDI62DzufROcOCoD8eJyZrw2eLkRiE3TvG0V27A3z6uMB05 vECu29z/HYu0PuKiELnRA== X-UI-Out-Filterresults: notjunk:1;V03:K0:MVbxWrWMr1Q=:a9GT5HLKJt1tVYwVdhg7+5 6A31l7lbfFfa83E6L6h8KdKAX9IriKPW/qQL+jw5wCVh0hGKUuxAcA0B2/FSBcbaM8rQl7Gwt He+6esglESWmP0zQWntoTlIZaqFd0xUxHAusBAq4lPMujXgMUDAO/TzueO8nNHo/6VvXTGBf5 pYFJJV7OYiRK6jgANJlJUO18a1PAmyu70gKU37PqaCcInxVE9DJhSx9poqVOX8tTqBfMowisN 26yprWYGZGNyRnwfk4+WEKbLTZB6ZUDkeTZy2XcaM7Y5F2473uuVlGegLLv72wQXav3vggZtp sh1w8DJATihkjiNGBPHv6Ixn0b8L+vkk78Jpzy4fLsw4Yy5nOsYthb2xXkNbLMR6+q2l3ZLBs 8Lwi8BT/lzXNwrNUmEqZxZqIThUEfG7GbGVERjiF7EB0WMU/avv0kkyRckDgOv5bhS3+RGgEk vmBvebykFjbVwPaTBTGpZgG2wTVfMde5/Z56W4wL4gN3gqK+nSiQ8vEeD1BPy3gtfSJE445Zt GTe3u1ArTStYtf2x9jWna5wZ3MuGy7xuPqXWI1xGh779w0bPr/8nB+79yMu2n8oPXNdbVGTPM krT0DxSarSIb7lU6+U1ioYt3JYXx1i5T3wNsIAaxNei8Z9GP+dX1Hx3TewDhMdoMGWo/mHwL7 Vc7aOQd6BxyVC1D09URHRBzvTtyEZxQPmNnjfeNlDpcZHPPDQdZ1ZVElC2KsEF6arda0AALSj FkrvO0yuVCItM+Y/gdi1y03dLrWdsKgUzAoVmgZRW2ZFYWORPFlvrpdEcTBu0GSGPgEuboa0K Rwf2lOWE+ycR3Zr1AlsI/mlvueqBzga409sOz/FZMkJqZagHb0XKJr4qum5U6ZvlaJiLwgk55 8OzgtbMTpY9IS4JHqq8Ezajua6qSq+GjK8wq9dj2WK5akmix8lthwwKhKSFBB0xZxTdXPUKsp 0iTHrZdwmK+q6R7MVvuwHHEwATynty962r8pxbAu10bvhzdVUw+wUhQ7KhkpbpUMkR0zb4VJ4 3pnHG0vwAFI2qRw6bJiTtKekycW1eNvwrLTAQfbC5Eqz7/qYTkW2rItDJ1JOpSz0U43IpfTcs sdys7rCr9sVc7PiWXM9aXlPaaak9viJ6Stf4LSjY5n+ahm+NyNnHXh5fw== 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