linux-kernel - Re: [PATCH v6 14/18] drm/virtio: rework virtio_gpu_transfer_from_host

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190704114756.eavkszsgsyymns3m@sirius.home.kraxel.org>
Date:   Thu, 4 Jul 2019 13:47:56 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Chia-I Wu <olvaffe@...il.com>
Cc:     ML dri-devel <dri-devel@...ts.freedesktop.org>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 14/18] drm/virtio: rework
 virtio_gpu_transfer_from_host_ioctl fencing

On Wed, Jul 03, 2019 at 01:05:12PM -0700, Chia-I Wu wrote:
> On Tue, Jul 2, 2019 at 7:19 AM Gerd Hoffmann <kraxel@...hat.com> wrote:
> >
> > Switch to the virtio_gpu_array_* helper workflow.
> (just repeating my question on patch 6)
> 
> Does this fix the obj refcount issue?  When was the issue introduced?

obj refcount should be fine in both old and new code.

old code:
  drm_gem_object_lookup
  drm_gem_object_put_unlocked

new code:
  virtio_gpu_array_from_handles
  virtio_gpu_array_put_free (in virtio_gpu_dequeue_ctrl_func).

Or did I miss something?

cheers,
  Gerd