linux-fsdevel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Vivek Goyal <vgoyal@redhat.com>
To: linux-fsdevel@vger.kernel.org,
	virtualization@lists.linux-foundation.org, miklos@szeredi.hu
Cc: linux-kernel@vger.kernel.org, virtio-fs@redhat.com,
	vgoyal@redhat.com, stefanha@redhat.com, dgilbert@redhat.com,
	mst@redhat.com
Subject: [PATCH 13/18] virtiofs: Do not access virtqueue in request submission path
Date: Thu,  5 Sep 2019 15:48:54 -0400	[thread overview]
Message-ID: <20190905194859.16219-14-vgoyal@redhat.com> (raw)
In-Reply-To: <20190905194859.16219-1-vgoyal@redhat.com>

In request submission path it is possible that virtqueue is already gone
due to driver->remove(). So do not access it in dev_dbg(). Use pr_debug()
instead.

If virtuqueue is gone, this will result in NULL pointer deference.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
---
 fs/fuse/virtio_fs.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 40259368a6bd..01bbf2c0e144 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -888,10 +888,10 @@ __releases(fiq->waitq.lock)
 	fs = fiq->priv;
 	fc = fs->vqs[queue_id].fud->fc;
 
-	dev_dbg(&fs->vqs[queue_id].vq->vdev->dev,
-		"%s: opcode %u unique %#llx nodeid %#llx in.len %u out.len %u\n",
-		__func__, req->in.h.opcode, req->in.h.unique, req->in.h.nodeid,
-		req->in.h.len, fuse_len_args(req->out.numargs, req->out.args));
+	pr_debug("%s: opcode %u unique %#llx nodeid %#llx in.len %u out.len %u"
+		 "\n", __func__, req->in.h.opcode, req->in.h.unique,
+		 req->in.h.nodeid, req->in.h.len,
+		 fuse_len_args(req->out.numargs, req->out.args));
 
 	fpq = &fs->vqs[queue_id].fud->pq;
 	spin_lock(&fpq->lock);
-- 
2.20.1


  parent reply	other threads:[~2019-09-05 19:50 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-05 19:48 [PATCH 00/18] virtiofs: Fix various races and cleanups round 1 Vivek Goyal
2019-09-05 19:48 ` [PATCH 01/18] virtiofs: Remove request from processing list before calling end Vivek Goyal
2019-09-06 10:40   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 02/18] virtiofs: Check whether hiprio queue is connected at submission time Vivek Goyal
2019-09-06 10:43   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 03/18] virtiofs: Pass fsvq instead of vq as parameter to virtio_fs_enqueue_req Vivek Goyal
2019-09-06 10:44   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 04/18] virtiofs: Check connected state for VQ_REQUEST queue as well Vivek Goyal
2019-09-06 10:45   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 05/18] Maintain count of in flight requests for VQ_REQUEST queue Vivek Goyal
2019-09-06 10:46   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 06/18] virtiofs: ->remove should not clean virtiofs fuse devices Vivek Goyal
2019-09-06 10:47   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 07/18] virtiofs: Stop virtiofs queues when device is being removed Vivek Goyal
2019-09-06 10:47   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 08/18] virtiofs: Drain all pending requests during ->remove time Vivek Goyal
2019-09-06 10:52   ` Stefan Hajnoczi
2019-09-06 14:17     ` Vivek Goyal
2019-09-06 14:18       ` Michael S. Tsirkin
2019-09-09 16:10         ` Stefan Hajnoczi
2019-09-08 10:11   ` [Virtio-fs] " piaojun
2019-09-05 19:48 ` [PATCH 09/18] virtiofs: Add an helper to start all the queues Vivek Goyal
2019-09-06 10:54   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 10/18] virtiofs: Do not use device managed mem for virtio_fs and virtio_fs_vq Vivek Goyal
2019-09-06 10:56   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 11/18] virtiofs: stop and drain queues after sending DESTROY Vivek Goyal
2019-09-06 11:50   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 12/18] virtiofs: Use virtio_fs_free_devs() in error path Vivek Goyal
2019-09-06 11:51   ` Stefan Hajnoczi
2019-09-05 19:48 ` Vivek Goyal [this message]
2019-09-06 11:52   ` [PATCH 13/18] virtiofs: Do not access virtqueue in request submission path Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 14/18] virtiofs: Add a fuse_iqueue operation to put() reference Vivek Goyal
2019-09-06 12:00   ` Stefan Hajnoczi
2019-09-06 13:35     ` Vivek Goyal
2019-09-05 19:48 ` [PATCH 15/18] virtiofs: Make virtio_fs object refcounted Vivek Goyal
2019-09-06 12:03   ` Stefan Hajnoczi
2019-09-06 13:50     ` Vivek Goyal
2019-09-09 16:12       ` Stefan Hajnoczi
2019-09-08 11:10   ` [Virtio-fs] " piaojun
2019-09-09 15:35     ` Vivek Goyal
2019-09-05 19:48 ` [PATCH 16/18] virtiofs: Use virtio_fs_mutex for races w.r.t ->remove and mount path Vivek Goyal
2019-09-06 12:05   ` Stefan Hajnoczi
2019-09-06 13:51     ` Vivek Goyal
2019-09-09 16:13       ` Stefan Hajnoczi
2019-09-08 11:19   ` [Virtio-fs] " piaojun
2019-09-05 19:48 ` [PATCH 17/18] virtiofs: Remove TODO to quiesce/end_requests Vivek Goyal
2019-09-06 12:06   ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 18/18] virtiofs: Remove TODO item from virtio_fs_free_devs() Vivek Goyal
2019-09-06 12:06   ` Stefan Hajnoczi
2019-09-06  8:15 ` [PATCH 00/18] virtiofs: Fix various races and cleanups round 1 Miklos Szeredi
2019-09-06 10:36   ` Stefan Hajnoczi
2019-09-06 11:52     ` Miklos Szeredi
2019-09-06 12:08       ` Vivek Goyal
2019-09-06 13:55         ` Miklos Szeredi
2019-09-06 13:57         ` Michael S. Tsirkin
2019-09-06 14:11           ` Miklos Szeredi
2019-09-06 14:17             ` Michael S. Tsirkin
2019-09-08 11:53       ` [Virtio-fs] " piaojun
2019-09-09 16:14         ` Stefan Hajnoczi
2019-09-09 16:18           ` Michael S. Tsirkin
2019-09-09 23:52           ` piaojun
2019-09-06 13:37 ` Michael S. Tsirkin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190905194859.16219-14-vgoyal@redhat.com \
    --to=vgoyal@redhat.com \
    --cc=dgilbert@redhat.com \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=miklos@szeredi.hu \
    --cc=mst@redhat.com \
    --cc=stefanha@redhat.com \
    --cc=virtio-fs@redhat.com \
    --cc=virtualization@lists.linux-foundation.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).