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authorJason Wang <jasowang@redhat.com>2014-11-27 18:04:03 +0800
committerPeter Maydell <peter.maydell@linaro.org>2014-11-28 10:29:20 +0000
commit771b6ed37e3aa188a7485560b949a41c6cf174dc (patch)
treeacf3136ca16ec7df6807947cb7f38569a1e6933e /hw/net
parent4cae4d5acaea23f3def84c8dc67ef5106323e5cb (diff)
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.c5
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);
}
}