Re: [PATCH net] vhost: synchronize IOTLB message with dev cleanup

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Jason Wang <jasowang@xxxxxxxxxx>
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@xxxxxxxxx>
> Fixes: 6b1e6cc7855b0 ("vhost: new device IOTLB API")
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>

Applied and queued up for -stable.



[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux