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 31DBDCCA479 for ; Fri, 1 Jul 2022 20:24:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231167AbiGAUYG (ORCPT ); Fri, 1 Jul 2022 16:24:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57864 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231862AbiGAUYD (ORCPT ); Fri, 1 Jul 2022 16:24:03 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3FC54387B1 for ; Fri, 1 Jul 2022 13:23:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1656707033; bh=rQmS4yIj+Kq0oK+U8Ryv32tYGBvhOaSYofJZQWpZKAg=; h=X-UI-Sender-Class:From:To:Subject:Date:In-Reply-To:References; b=fIOLdTnCwKdSF7QIxTmumraXGkfNUG0ClivcyASnedEIPIfK9MhHxNauXOXAW1Nw7 foY+RQl5EEiaYzBZWm4MIZfRM78rQlMArLqWC6AA5ngCeanzECZW3ZPNkeaaOMZ4zK cPTGeD+lt9v4lQk1EpDvJCI4IOFqfoQUYpzaslRY= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from p100.fritz.box ([92.116.182.192]) by mail.gmx.net (mrgmx104 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MgNh1-1nPltG2fT5-00hz1f; Fri, 01 Jul 2022 22:23:53 +0200 From: Helge Deller To: geert@linux-m68k.org, dri-devel@lists.freedesktop.org, daniel.vetter@ffwll.ch, linux-fbdev@vger.kernel.org Subject: [PATCH v2 1/4] fbcon: Disallow setting font bigger than screen size Date: Fri, 1 Jul 2022 22:23:49 +0200 Message-Id: <20220701202352.559808-2-deller@gmx.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220701202352.559808-1-deller@gmx.de> References: <20220701202352.559808-1-deller@gmx.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:LHLDoqxvdfUun4EcG3tmI0dlKtgbAn1uYwunDECGEcGaabXAxNN Bs/x/xwEaj5rGknXyHB4AlMOUqfFfOIFITBzIQmNGDGw4Ingi2HTebkfNfjkiAbwSmPdZ6D dqrPPbGT8vVuZI+0qfZJNI1F7KNfCQ4leIA5+vOQCaaEmpxouuvIl1nj0ZidKW0bvKMhLZ6 eTYxUl2xqM+zWGSDsVuZw== X-UI-Out-Filterresults: notjunk:1;V03:K0:cB2/OJqA+lE=:QEDxZRbm+VSDc5BqF44nrB KL2bW+V+Q950YrP+hTgVPQNcuWwaiXcYaySC07CFbvOQGnAk1F0upBe7bGbBU7hlRRFZ5JZno Y/9bacluv/lopfOnozzFyrpUpa0nE6zXpujxSPePiwSUYShFMRx/DOpCUxm+y0CIrPb/Hk9Tx qAWmsgZGBeabUiuDjS9yRyITZ3dpFbkOSeihRglAN/bhGGUTsibTf8gfyke6Zg4I0ZizZJGSP LqBPge22derxF01P+pdFUPe3HbQMRAM5qJcW/AjO/rF1FEfEegR0pV4H7y+WyN0xUSPHTa0bF YOXnoKU2aE2r5gKiyvRUsqN5fcG8m+pvHTxy5D361CLwajww78O9qFcx1BUo7bycfELPb91OX eyBkgg9eM3FyFvZzVIJQ33JBsch/BTkriESHl2WoBSDVbIZ59BssIxJkFefMJc5zcKS53Hjhr p3iq9tsU5iEGpOXyvEC1LylTJmPT4TTNTIZKsaPfW6iw2rQavKJ57GqkFOuKVe8t02iIPCCR4 SRjSRHg4iaPHCq86FPrDjPCiThjiCsrSnHjUlcMfIuUBOg4CX42qhqjn2ZfPoz6MsjILMsMPr 7BWy14hJnP+/O21MrD3jWFzR3fMcJzAtwEjoA0pqNl4crxnflFT1LcBt8fp06/0ENTY4r45SZ LD3S2L7FtUehcTCsVXe5Lg1vWblkd+nvrvU/IjmXlyq/fudsxk0ydThGMmrfs5tZK3VDVjOqC nHBcUOSsgmUVlwQUPeDX6cae8ecmMOybbFXAnLuprUUXKgoPQfORBDvZ1JwF3QTHWqGCs5qQc yVoo4jCcvU+RUYCNUnJoxHl2g3I237j2xFqzcpAqu0pFybHpDSoEoZEeObeYp6IeThzxZylSS C/L25gU7BiwNpRNFlDUnb9WzKcnR5fC5wUNzUofvCDqfRaMbenRj+wGqtVY7Mjte49qEt8giD Tyt3JljEDxEobwiXDyPa3rAclHLBzl6eW2egbsHj4utPWVGhEEAk12dw53x872NfyS3ezmENs CYR/4yYBx6X7cE+RMpw9W3XH9r83yDGe+KBsHPVO/7+zqAOQ/g30ELAwRSkPFxlYI9YjMposA 1gup/fG89zgRtUM7t8vRcdEmg9IUePiJwMv2++R2bkm60OyaLzmitpY5w== 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