From patchwork Mon Feb 20 11:02:47 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Starkey X-Patchwork-Id: 9582545 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 96F306057F for ; Mon, 20 Feb 2017 11:03:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 89E1A287E9 for ; Mon, 20 Feb 2017 11:03:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7ED47287FA; Mon, 20 Feb 2017 11:03:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 49B2428841 for ; Mon, 20 Feb 2017 11:03:01 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7EBEA6E3AB; Mon, 20 Feb 2017 11:03:00 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from foss.arm.com (foss.arm.com [217.140.101.70]) by gabe.freedesktop.org (Postfix) with ESMTP id 234B76E3A6 for ; Mon, 20 Feb 2017 11:02:57 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0B270344; Mon, 20 Feb 2017 03:02:57 -0800 (PST) Received: from e106950-lin.cambridge.arm.com (e106950-lin.cambridge.arm.com [10.2.138.63]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6D55A3F23B; Mon, 20 Feb 2017 03:02:56 -0800 (PST) From: Brian Starkey To: intel-gfx@lists.freedesktop.org Date: Mon, 20 Feb 2017 11:02:47 +0000 Message-Id: <1487588568-5033-4-git-send-email-brian.starkey@arm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1487588568-5033-1-git-send-email-brian.starkey@arm.com> References: <1487588568-5033-1-git-send-email-brian.starkey@arm.com> Subject: [Intel-gfx] [PATCH i-g-t v2 4/5] lib/igt_kms: Fix memory corruption when there's no cursor plane X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP The dynamic plane support means that if there's no cursor plane, then there is no space in the pipe->planes array for it, and thus assigning a "drm_plane-less" plane is out-of-bounds and leads to heap corruption and later crashes. The "drm_plane-less" cursor plane isn't included in n_planes anyway, which means there's no way to ever access it/know that it's there - so just remove it entirely. Fixes: 36656239ef96 lib/igt_kms: Implement dynamic plane count support Signed-off-by: Brian Starkey Reviewed-by: Robert Foss --- lib/igt_kms.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/lib/igt_kms.c b/lib/igt_kms.c index 2073a6acfa7b..60c4c260bf2d 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -1692,12 +1692,6 @@ void igt_display_init(igt_display_t *display, int drm_fd) memset(&pipe->planes[last_plane], 0, sizeof *plane); } - } else { - /* Add drm_plane-less cursor */ - plane = &pipe->planes[p]; - plane->pipe = pipe; - plane->index = p; - plane->type = DRM_PLANE_TYPE_CURSOR; } pipe->n_planes = n_planes;