This patch fixes the segfault issue in the case vhost receives new 
VHOST_SET_MEM_TABLE message without VHOST_VRING_GET_VRING_BASE(which we uses as 
the stop message).

Signed-off-by: Huawei Xie <huawei.xie at intel.com>
---
 lib/librte_vhost/vhost_user/virtio-net-user.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/librte_vhost/vhost_user/virtio-net-user.c 
b/lib/librte_vhost/vhost_user/virtio-net-user.c
index 97c5177..aa08706 100644
--- a/lib/librte_vhost/vhost_user/virtio-net-user.c
+++ b/lib/librte_vhost/vhost_user/virtio-net-user.c
@@ -109,6 +109,10 @@ user_set_mem_table(struct vhost_device_ctx ctx, struct 
VhostUserMsg *pmsg)
        if (dev == NULL)
                return -1;

+       /* Remove from the data plane. */
+       if (dev->flags & VIRTIO_DEV_RUNNING)
+               notify_ops->destroy_device(dev);
+
        if (dev->mem) {
                free_mem_region(dev);
                free(dev->mem);
-- 
1.8.1.4

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