From patchwork Sat Jun 25 12:25:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Helge Deller X-Patchwork-Id: 584996 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 621D3C43334 for ; Sat, 25 Jun 2022 12:25:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232944AbiFYMZM (ORCPT ); Sat, 25 Jun 2022 08:25:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57766 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232602AbiFYMZK (ORCPT ); Sat, 25 Jun 2022 08:25:10 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B04861E3CD for ; Sat, 25 Jun 2022 05:25:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1656159904; bh=XzWlqKg0tZRmkyyhAvOskP/AntTF8gQ4y3i07JTitN0=; h=X-UI-Sender-Class:From:To:Subject:Date:In-Reply-To:References; b=Wr7PGcBvGrftl27TdTYgD4sB1GXS4scvf+MKOVNTny3VJP0xPekV3HiEmKec73DOV 9Lo+3M8ABdGrds+AohjfpeuNyixW+hNhxVmbTa+JS0zgOJ0UNcu6GuIN43EW7GLjBV 4ADJOk0ByrfAaPNFZyxqVCx6IfT5BAv3htk7G4Qc= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from p100.fritz.box ([92.116.162.44]) by mail.gmx.net (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MnakR-1nM4za3cCz-00ja5s; Sat, 25 Jun 2022 14:25:03 +0200 From: Helge Deller To: linux-fbdev@vger.kernel.org, daniel.vetter@ffwll.ch, dri-devel@lists.freedesktop.org, deller@gmx.de Subject: [PATCH v2 4/4] fbmem: Catch possible driver bugs regarding too small virtual screen size Date: Sat, 25 Jun 2022 14:25:02 +0200 Message-Id: <20220625122502.68095-5-deller@gmx.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220625122502.68095-1-deller@gmx.de> References: <20220625122502.68095-1-deller@gmx.de> MIME-Version: 1.0 X-Provags-ID: V03:K1:W8cNngBMUBHHJUV7dXjFa42WjdXUhH2wea0EeF11rpP1tPAtcrj Vy4tmjTNURbq+eTLhYSJ3RbTSUqWcUOiJh6tMT8hIxIdAt+3g0UBYjPfsRHg+/1Jfvt6uSz tkKkaHPi3xNpb4hamxPTSKlGbLRmYfthkj0i72290nt7jfNHaTATIMH4bWHxHhjVPpEvCEP AKwv6u3Wv3lMQkKJHJsMA== X-UI-Out-Filterresults: notjunk:1;V03:K0:j0Cb/1I6yu4=:kKTYRcbYUs3HdoMx5WWEa9 PWTco1Zyie4e+8SCPHs7CfcbBKjiYeXfSiyuRZwqzSUXYBPKn+P4XMedgrbVbzx5sifvqZ4qT zs0guonrV/KGovkhFUlEP+ztrTYlqQODHsLqHImFx/151dDjauIpWizL471bVqUeLW/SnlZh6 RuFIatAIRoMkKxGEoKICfNV/EUL0P8MEQ7TNDQ1G+dojcBmxUSbWSQFUz+cx0u4ia2DPQRiiW 02I+/vZZCqmMUkb9i1ueAIY9LjARrAdSwTdyb4W6M8uCtg4CaIQfjtcXV8lx39lez1I2lYq08 C+KEnB+yk9tUVJ/FSn1ajoVXeJnXswos/BY+mjBdE3CBiZmPjb75NLbYWSu/0XeTiAz2tv8vS xm6l28aj0WyDSIhMcb+d6n6pWCq73CwATDnpq+FUS+X+8IJLSuRxSK5skIB3Dz3bIzRT7Q0sA /nlsd7a0XHhFOYglzzQ8fO7aRHftjDojl8HOKNFpyd99YGibUdYbogYkGejd7P/6PHaglxyCd g6N4AARSvp6lDOdH8nZTf1vkmhjU6SDeq2E2g+Mq4oNH02GzeBGyXXg1TbVZG1cNds54xoTtg J9P5HAOgSi5HQbP86inBoEfhHWhAP38R9uKHcroXAc63W1EdM8cPn7dN04WWyfR+P6yfE2yPX 0qdDK1FS+KcLlVeznK0LkpnzFltXUSz6E8tsMnLTQcbUCIXM3XX1vmE2q5mti26kn6u4oyL/n 5OaB4zD97mr7GuzJoWQAKSac/7cn6NFxaxAxMd0QMs+YyQxI8nNd1LwZD5bV7zYLjzbEFPrRe YHFffqT+1AxFrNWYeRXPpVO0lH8W/NTTUSdJPye5nUpyQY245VXYCmT7HIH07U7STPeJS6NJf dE4LdiB74KhARZVo9Nv1LIC7P8/MNV0QcZcNIFfEVzM7QNKpu/A5/xsJbURiWfjZqRY7Fl/1G h2+wn+frd5qJIaDnJDC/yGTljlPtPfKWT+LYqqyrNMsu6k8lIaF2EAFtn7Xt6yJ+ITK4TSd8Q 8V7RzQzK2is6145W5N7eA7Opk0Tab0mVS83NXmLep6rrHxHYqs99X4SdRURfnqUbfzSfpcM6S F5MV6LrRZH1GiVa9O/njI+G76d03bIV+fwNLv4ha9TZTusRXjlP2TwmCQ== Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Make sure that we catch, report and fix up fbdev and drm graphic drivers which got the virtual screen resolution smaller than the physical screen resolution. Signed-off-by: Helge Deller Cc: stable@vger.kernel.org # v5.4+ --- drivers/video/fbdev/core/fbmem.c | 6 ++++++ 1 file changed, 6 insertions(+) -- 2.35.3 diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c index 50fb66b954d6..6d262e341023 100644 --- a/drivers/video/fbdev/core/fbmem.c +++ b/drivers/video/fbdev/core/fbmem.c @@ -1006,6 +1006,12 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) if (var->xres < 8 || var->yres < 8) return -EINVAL; + /* make sure virtual resolution >= physical resolution */ + if (WARN_ON(var->xres_virtual < var->xres)) + var->xres_virtual = var->xres; + if (WARN_ON(var->yres_virtual < var->yres)) + var->yres_virtual = var->yres; + /* Too huge resolution causes multiplication overflow. */ if (check_mul_overflow(var->xres, var->yres, &unused) || check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused))