From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: [PATCH v2 15/15] virtio_net: fix use after free on allocation failure Date: Mon, 6 Oct 2014 18:11:35 +0300 Message-ID: <1412608214-31944-16-git-send-email-mst@redhat.com> References: <1412608214-31944-1-git-send-email-mst@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org, Rusty Russell , virtualization@lists.linux-foundation.org, Cornelia Huck , netdev@vger.kernel.org To: linux-kernel@vger.kernel.org Return-path: Content-Disposition: inline In-Reply-To: <1412608214-31944-1-git-send-email-mst@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org In the extremely unlikely event that driver initialization fails after RX buffers are added, virtio net frees RX buffers while VQs are still active, potentially causing device to use a freed buffer. To fix, reset device first - same as we do on device removal. Signed-off-by: Michael S. Tsirkin Reviewed-by: Cornelia Huck --- drivers/net/virtio_net.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 430f3ae..3551417 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -1830,6 +1830,8 @@ static int virtnet_probe(struct virtio_device *vdev) return 0; free_recv_bufs: + vi->vdev->config->reset(vdev); + free_receive_bufs(vi); unregister_netdev(dev); free_vqs: -- MST