Commit 2d5a1b31 authored by Gao feng's avatar Gao feng Committed by Greg Kroah-Hartman

vsock: lookup and setup guest_cid inside vhost_vsock_lock

[ Upstream commit 6c083c2b ]

Multi vsocks may setup the same cid at the same time.
Signed-off-by: 's avatarGao feng <omarapazanadi@gmail.com>
Signed-off-by: 's avatarMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: 's avatarStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: 's avatarSasha Levin <sashal@kernel.org>
parent adcc5726
......@@ -50,11 +50,10 @@ static u32 vhost_transport_get_local_cid(void)
return VHOST_VSOCK_DEFAULT_HOST_CID;
}
static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
static struct vhost_vsock *__vhost_vsock_get(u32 guest_cid)
{
struct vhost_vsock *vsock;
spin_lock_bh(&vhost_vsock_lock);
list_for_each_entry(vsock, &vhost_vsock_list, list) {
u32 other_cid = vsock->guest_cid;
......@@ -63,15 +62,24 @@ static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
continue;
if (other_cid == guest_cid) {
spin_unlock_bh(&vhost_vsock_lock);
return vsock;
}
}
spin_unlock_bh(&vhost_vsock_lock);
return NULL;
}
static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
{
struct vhost_vsock *vsock;
spin_lock_bh(&vhost_vsock_lock);
vsock = __vhost_vsock_get(guest_cid);
spin_unlock_bh(&vhost_vsock_lock);
return vsock;
}
static void
vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
struct vhost_virtqueue *vq)
......@@ -607,11 +615,12 @@ static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid)
return -EINVAL;
/* Refuse if CID is already in use */
other = vhost_vsock_get(guest_cid);
if (other && other != vsock)
return -EADDRINUSE;
spin_lock_bh(&vhost_vsock_lock);
other = __vhost_vsock_get(guest_cid);
if (other && other != vsock) {
spin_unlock_bh(&vhost_vsock_lock);
return -EADDRINUSE;
}
vsock->guest_cid = guest_cid;
spin_unlock_bh(&vhost_vsock_lock);
......
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