On Thu, 11/27 13:59, Jason Wang wrote: > 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.
I'm a little confused. Commit message mentioned "other functions" but in this patch only virtio_net_handle_ctrl is changed. So is this complete? Fam > > Cc: Wen Congyang <we...@cn.fujitsu.com> > Cc: Stefano Stabellini <stefano.stabell...@eu.citrix.com> > Cc: qemu-sta...@nongnu.org > Signed-off-by: Jason Wang <jasow...@redhat.com> > --- > hw/net/virtio-net.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c > index 9b88775..fdb4edd 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 +808,12 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, > VirtQueue *vq) > exit(1); > } > > - iov = elem.out_sg; > iov_cnt = elem.out_num; > + s = sizeof(struct iovec) * elem.out_num; > + iov = g_malloc(s); > + memcpy(iov, elem.out_sg, s); > + iov2 = iov; > + > 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 +837,7 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, > VirtQueue *vq) > > virtqueue_push(vq, &elem, sizeof(status)); > virtio_notify(vdev, vq); > + g_free(iov2); > } > } > > -- > 1.9.1 > >