From: David Miller <davem@davemloft.net>
To: jasowang@redhat.com
Cc: mst@redhat.com, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] vhost: synchronize IOTLB message with dev cleanup
Date: Thu, 24 May 2018 22:10:18 -0400 (EDT) [thread overview]
Message-ID: <20180524.221018.776118684279850747.davem@davemloft.net> (raw)
In-Reply-To: <1526990337-24892-1-git-send-email-jasowang@redhat.com>
From: Jason Wang <jasowang@redhat.com>
Date: Tue, 22 May 2018 19:58:57 +0800
> DaeRyong Jeong reports a race between vhost_dev_cleanup() and
> vhost_process_iotlb_msg():
>
> Thread interleaving:
> CPU0 (vhost_process_iotlb_msg) CPU1 (vhost_dev_cleanup)
> (In the case of both VHOST_IOTLB_UPDATE and
> VHOST_IOTLB_INVALIDATE)
> ===== =====
> vhost_umem_clean(dev->iotlb);
> if (!dev->iotlb) {
> ret = -EFAULT;
> break;
> }
> dev->iotlb = NULL;
>
> The reason is we don't synchronize between them, fixing by protecting
> vhost_process_iotlb_msg() with dev mutex.
>
> Reported-by: DaeRyong Jeong <threeearcat@gmail.com>
> Fixes: 6b1e6cc7855b0 ("vhost: new device IOTLB API")
> Signed-off-by: Jason Wang <jasowang@redhat.com>
Applied and queued up for -stable.
prev parent reply other threads:[~2018-05-25 2:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-22 11:58 [PATCH net] vhost: synchronize IOTLB message with dev cleanup Jason Wang
2018-05-24 19:35 ` David Miller
2018-05-25 0:33 ` Michael S. Tsirkin
2018-05-25 2:10 ` David Miller [this message]
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