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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3576DC433E0 for ; Tue, 26 May 2020 19:16:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0CEA520776 for ; Tue, 26 May 2020 19:16:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590520611; bh=dwPwdG0SK+kS1i7Rh+GeJcYZE0NSE+OYrDVqABO7+H4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WAdeZ/QduoF57ZFp1Hxj/18DxFcBssS+MWb2NxI2h0cEkKgAD6tZvGh0LdBzjJwzT kH6WAnJrc/3n+DaoGOWksge6bxnqoutwCHHklRU1/Oa3Roj0BSKORHBbNJ8YmbpiWj oe3WLkalGbtwRodUgPE0XOGYWcX5S0WakeLTQ2qw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392303AbgEZTQu (ORCPT ); Tue, 26 May 2020 15:16:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:46926 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404393AbgEZTPV (ORCPT ); Tue, 26 May 2020 15:15:21 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 50D72208B6; Tue, 26 May 2020 19:15:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590520520; bh=dwPwdG0SK+kS1i7Rh+GeJcYZE0NSE+OYrDVqABO7+H4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MUSmbcGbV2NXRP37B5eY8dtH9ODQShc8929s2EaroR5q5198bzMkO79L2duK/l1dr F3m4fX2k8AnBWXQCzqEs2kdZDmjBmMmFM+DpSk+q/3E4VtVGnuHZXHCC+NBtqefvW7 zNpkuQmfPb75ucpFQToEcyIotdTZD4cf3RVRst24= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paul Cercueil , Christian Gmeiner , Lucas Stach Subject: [PATCH 5.6 072/126] drm/etnaviv: fix perfmon domain interation Date: Tue, 26 May 2020 20:53:29 +0200 Message-Id: <20200526183944.293494261@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200526183937.471379031@linuxfoundation.org> References: <20200526183937.471379031@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christian Gmeiner commit 40b697e256ccdb88aaff424b44b4d300eb8460e8 upstream. The GC860 has one GPU device which has a 2d and 3d core. In this case we want to expose perfmon information for both cores. The driver has one array which contains all possible perfmon domains with some meta data - doms_meta. Here we can see that for the GC860 two elements of that array are relevant: doms_3d: is at index 0 in the doms_meta array with 8 perfmon domains doms_2d: is at index 1 in the doms_meta array with 1 perfmon domain The userspace driver wants to get a list of all perfmon domains and their perfmon signals. This is done by iterating over all domains and their signals. If the userspace driver wants to access the domain with id 8 the kernel driver fails and returns invalid data from doms_3d with and invalid offset. This results in: Unable to handle kernel paging request at virtual address 00000000 On such a device it is not possible to use the userspace driver at all. The fix for this off-by-one error is quite simple. Reported-by: Paul Cercueil Tested-by: Paul Cercueil Fixes: ed1dd899baa3 ("drm/etnaviv: rework perfmon query infrastructure") Cc: stable@vger.kernel.org Signed-off-by: Christian Gmeiner Signed-off-by: Lucas Stach Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/etnaviv/etnaviv_perfmon.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c @@ -453,7 +453,7 @@ static const struct etnaviv_pm_domain *p if (!(gpu->identity.features & meta->feature)) continue; - if (meta->nr_domains < (index - offset)) { + if (index - offset >= meta->nr_domains) { offset += meta->nr_domains; continue; }