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vhost-vsock: detach the virqueue element in case of error 

In vhost_vsock_common_send_transport_reset(), if an element popped from
the virtqueue is invalid, we should call virtqueue_detach_element() to
detach it from the virtqueue before freeing its memory.

Fixes: fc0b9b0e1c ("vhost-vsock: add virtio sockets device")
Fixes: CVE-2022-26354
Cc: qemu-stable@nongnu.org
Reported-by: VictorV <vv474172261@gmail.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20220228095058.27899-1-sgarzare@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
master
Stefano Garzarella 2022-02-28 10:50:58 +01:00 committed by Michael S. Tsirkin
parent 4ccd5fe22f
commit 8d1b247f37
1 changed files with 7 additions and 3 deletions
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10
hw/virtio/vhost-vsock-common.c
View File

@ -153,19 +153,23 @@ static void vhost_vsock_common_send_transport_reset(VHostVSockCommon *vvc)
if (elem->out_num) {
error_report("invalid vhost-vsock event virtqueue element with "
"out buffers");
goto out;
goto err;
}
if (iov_from_buf(elem->in_sg, elem->in_num, 0,
&event, sizeof(event)) != sizeof(event)) {
error_report("vhost-vsock event virtqueue element is too short");
goto out;
goto err;
}
virtqueue_push(vq, elem, sizeof(event));
virtio_notify(VIRTIO_DEVICE(vvc), vq);
out:
g_free(elem);
return;
err:
virtqueue_detach_element(vq, elem, 0);
g_free(elem);
}