Commit c460f057 authored May 02, 2012 by Jason Wang Committed by Michael S. Tsirkin May 02, 2012

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>

parent b92946e2

drivers/vhost/net.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -166,7 +166,7 @@ static void handle_tx(struct vhost_net *net)
		if (wmem < sock->sk->sk_sndbuf / 2)
		tx_poll_stop(net);
		hdr_size = vq->vhost_hlen;
		zcopy = vhost_sock_zcopy(sock);
		zcopy = vq->ubufs;

		for (;;) {
		/* Release DMAs done buffers first */