From patchwork Tue Feb 11 13:50:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gerd Hoffmann X-Patchwork-Id: 11375537 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 809CD92A for ; Tue, 11 Feb 2020 13:51:05 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5F35920714 for ; Tue, 11 Feb 2020 13:51:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="e5Hu8ndv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5F35920714 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 357C46EA6E; Tue, 11 Feb 2020 13:50:59 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id EAFE66EA6B for ; Tue, 11 Feb 2020 13:50:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1581429057; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=S+mwJdJVy8UUeEbXPovOpoMig4tdZvTNhvh0a+GkyOI=; b=e5Hu8ndvdrhGe8NLgTqwnF80H//ZdHXHvfX+jefvg/aJuqGZOfCa5sXRrmamja33cUo+kN Yqs9XfUqOxLAGopVWrQLY/mYwKb4eNX19zxmKgMjyHb0Bw/PGNmr07HgDJ7PkFfUlNV3s4 EovTnal0483ehK5qTqRjWH+vTDz+Iu4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-241-u1_3pVzhMP65uv71nLedkg-1; Tue, 11 Feb 2020 08:50:53 -0500 X-MC-Unique: u1_3pVzhMP65uv71nLedkg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B1E7418CA241; Tue, 11 Feb 2020 13:50:51 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-116-112.ams2.redhat.com [10.36.116.112]) by smtp.corp.redhat.com (Postfix) with ESMTP id C11EE5C1D6; Tue, 11 Feb 2020 13:50:48 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 0856717448; Tue, 11 Feb 2020 14:50:48 +0100 (CET) From: Gerd Hoffmann To: dri-devel@lists.freedesktop.org Subject: [PATCH 1/2] drm/virtio: fix virtio_gpu_execbuffer_ioctl locking Date: Tue, 11 Feb 2020 14:50:46 +0100 Message-Id: <20200211135047.22261-2-kraxel@redhat.com> In-Reply-To: <20200211135047.22261-1-kraxel@redhat.com> References: <20200211135047.22261-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Airlie , open list , "open list:VIRTIO GPU DRIVER" , Gerd Hoffmann , gurchetansingh@chromium.org MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Lockdep says we can't call vmemdup() while having objects reserved because it needs the mmap semaphore. So reorder the calls reserve the objects later. Signed-off-by: Gerd Hoffmann --- drivers/gpu/drm/virtio/virtgpu_ioctl.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c index 205ec4abae2b..0477d1250f2d 100644 --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c @@ -126,22 +126,22 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data, bo_handles = NULL; } - if (buflist) { - ret = virtio_gpu_array_lock_resv(buflist); - if (ret) - goto out_unused_fd; - } - buf = vmemdup_user(u64_to_user_ptr(exbuf->command), exbuf->size); if (IS_ERR(buf)) { ret = PTR_ERR(buf); - goto out_unresv; + goto out_unused_fd; + } + + if (buflist) { + ret = virtio_gpu_array_lock_resv(buflist); + if (ret) + goto out_memdup; } out_fence = virtio_gpu_fence_alloc(vgdev); if(!out_fence) { ret = -ENOMEM; - goto out_memdup; + goto out_unresv; } if (out_fence_fd >= 0) { @@ -160,11 +160,11 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data, vfpriv->ctx_id, buflist, out_fence); return 0; -out_memdup: - kvfree(buf); out_unresv: if (buflist) virtio_gpu_array_unlock_resv(buflist); +out_memdup: + kvfree(buf); out_unused_fd: kvfree(bo_handles); if (buflist)