[PATCH 22.11] vhost: fix virtqueue access check in vhost-user setup

[David Marchand]

[ upstream commit b3e42d92362bcc75df21c5b86ba7c0685b40a3bf ]

Calling vring_invalidate must be done with a (write) lock taken on the
virtqueue.

Fixes: 72d002b3ebda ("vhost: fix vring address handling during live migration")

Signed-off-by: David Marchand <david.marchand at redhat.com>
Acked-by: Eelco Chaudron <echaudro at redhat.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 lib/vhost/vhost_user.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
index 8df66e68b3..66ab68fa56 100644
--- a/lib/vhost/vhost_user.c
+++ b/lib/vhost/vhost_user.c
@@ -2144,7 +2144,9 @@ vhost_user_get_vring_base(struct virtio_net **pdev,
 
 	vhost_user_iotlb_flush_all(vq);
 
+	rte_spinlock_lock(&vq->access_lock);
 	vring_invalidate(dev, vq);
+	rte_spinlock_unlock(&vq->access_lock);
 
 	return RTE_VHOST_MSG_RESULT_REPLY;
 }
-- 
2.43.0