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vhost-vdpa: protect concurrent access to vhost device iotlb

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Protect vhost device iotlb by vhost_dev->mutex. Otherwise,
it might cause corruption of the list and interval tree in
struct vhost_iotlb if userspace sends the VHOST_IOTLB_MSG_V2
message concurrently.

Fixes: 4c8cf318("vhost: introduce vDPA-based backend")
Cc: stable@vger.kernel.org
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20210412095512.178-1-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xie Yongji 2021-04-12 17:55:12 +08:00 committed by Michael S. Tsirkin
parent bc04d93ea3
commit a9d064524f
1 changed files with 5 additions and 1 deletions
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6
drivers/vhost/vdpa.c
View File

@ -745,9 +745,11 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
const struct vdpa_config_ops *ops = vdpa->config;
int r = 0;
mutex_lock(&dev->mutex);
r = vhost_dev_check_owner(dev);
if (r)
return r;
goto unlock;
switch (msg->type) {
case VHOST_IOTLB_UPDATE:
@ -768,6 +770,8 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
r = -EINVAL;
break;
}
unlock:
mutex_unlock(&dev->mutex);
return r;
}