Re: [PATCH 4/4] net/virtio: return error when device_opts arg is NULL

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Nov 14, 2019 at 03:16:13PM +0100, Jens Freimann wrote:
> device_opts could be NULL. Make sure we don't pass it to
> qemu_opts_to_dict. When we made sure it can't be NULL we can also remove
> it from the if condition.
> This fixes CID 1407222.
> 
> Fixes: 9711cd0dfc3f ("net/virtio: add failover support")
> Signed-off-by: Jens Freimann <jfreimann@redhat.com>

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  hw/net/virtio-net.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 81650d4dc0..d53aa5796b 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -2878,9 +2878,12 @@ static int virtio_net_primary_should_be_hidden(DeviceListener *listener,
>              QemuOpts *device_opts)
>  {
>      VirtIONet *n = container_of(listener, VirtIONet, primary_listener);
> -    bool match_found;
> -    bool hide;
> +    bool match_found = false;
> +    bool hide = false;
>  
> +    if (!device_opts) {
> +        return -1;
> +    }
>      n->primary_device_dict = qemu_opts_to_qdict(device_opts,
>              n->primary_device_dict);
>      if (n->primary_device_dict) {
> @@ -2888,7 +2891,7 @@ static int virtio_net_primary_should_be_hidden(DeviceListener *listener,
>          n->standby_id = g_strdup(qdict_get_try_str(n->primary_device_dict,
>                      "failover_pair_id"));
>      }
> -    if (device_opts && g_strcmp0(n->standby_id, n->netclient_name) == 0) {
> +    if (g_strcmp0(n->standby_id, n->netclient_name) == 0) {
>          match_found = true;
>      } else {
>          match_found = false;
> -- 
> 2.21.0