diff options
| author | Jason Wang <jasowang@redhat.com> | 2014-11-27 18:04:03 +0800 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2014-11-28 10:29:20 +0000 |
| commit | 771b6ed37e3aa188a7485560b949a41c6cf174dc (patch) | |
| tree | acf3136ca16ec7df6807947cb7f38569a1e6933e /hw/net | |
| parent | 4cae4d5acaea23f3def84c8dc67ef5106323e5cb (diff) | |
| download | qemu-771b6ed37e3aa188a7485560b949a41c6cf174dc.zip | |
virtio-net: fix unmap leak
virtio_net_handle_ctrl() and other functions that process control vq
request call iov_discard_front() which will shorten the iov. This will
lead unmapping in virtqueue_push() leaks mapping.
Fixes this by keeping the original iov untouched and using a temp variable
in those functions.
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 1417082643-23907-1-git-send-email-jasowang@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/net')
| -rw-r--r-- | hw/net/virtio-net.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 9b88775fac..e574bd4322 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -798,7 +798,7 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) virtio_net_ctrl_ack status = VIRTIO_NET_ERR; VirtQueueElement elem; size_t s; - struct iovec *iov; + struct iovec *iov, *iov2; unsigned int iov_cnt; while (virtqueue_pop(vq, &elem)) { @@ -808,8 +808,8 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) exit(1); } - iov = elem.out_sg; iov_cnt = elem.out_num; + iov2 = iov = g_memdup(elem.out_sg, sizeof(struct iovec) * elem.out_num); s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); if (s != sizeof(ctrl)) { @@ -833,6 +833,7 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) virtqueue_push(vq, &elem, sizeof(status)); virtio_notify(vdev, vq); + g_free(iov2); } } |