vhost_net: zerocopy: fix possible NULL pointer dereference of vq->bufs
When we want to disable vhost_net backend while there's a tx work, a possible NULL pointer defernece may happen we we try to deference the vq->bufs after vhost_net_set_backend() assign a NULL to it. As suggested by Michael, fix this by checking the vq->bufs instead of vhost_sock_zcopy(). Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -166,7 +166,7 @@ static void handle_tx(struct vhost_net *net)
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if (wmem < sock->sk->sk_sndbuf / 2)
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tx_poll_stop(net);
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hdr_size = vq->vhost_hlen;
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zcopy = vhost_sock_zcopy(sock);
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zcopy = vq->ubufs;
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for (;;) {
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/* Release DMAs done buffers first */
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