[libvirt] [PATCH] ruby-libvirt: Don't crash in leases_wrap() by passing NULLs to rb_str_new2()

[Dan Williams]

On Thu, 2016-01-07 at 11:12 -0600, Dan Williams wrote:
> Not all lease values are mandatory, and when they aren't supplied
> by the libvirt driver they get set to NULL.  That makes
> rb_str_new2() bail out.

Ping?  Does this patch look OK or is there anything else I need to do
with it?  Is the submission procure for ruby-libvirt different than
normal libvirt?

Thanks!
Dan

> Signed-off-by: Dan Williams <dcbw at redhat.com>
> ---
> For example using the qemu driver we don't get 'iaid', and that
> makes ruby unhappy:
> 
> [{"iface"=>"virbr1", "expirytime"=>1452189569, "type"=>0,
> "mac"=>"52:54:00:05:2b:6f",
> "ipaddr"=>"192.168.121.49", "prefix"=>24, "hostname"=>"openshiftdev",
> "clientid"=>"ff:00:05:2b:6f:00:01:00:01:1e:21:55:ed:52:54:00:05:2b:6f
> "}]
> 
>  ext/libvirt/network.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/ext/libvirt/network.c b/ext/libvirt/network.c
> index 7c77d73..c250d7d 100644
> --- a/ext/libvirt/network.c
> +++ b/ext/libvirt/network.c
> @@ -269,14 +269,20 @@ static VALUE leases_wrap(VALUE arg)
>          rb_hash_aset(hash, rb_str_new2("expirytime"),
>                       LL2NUM(lease->expirytime));
>          rb_hash_aset(hash, rb_str_new2("type"), INT2NUM(lease
> ->type));
> -        rb_hash_aset(hash, rb_str_new2("mac"), rb_str_new2(lease
> ->mac));
> -        rb_hash_aset(hash, rb_str_new2("iaid"), rb_str_new2(lease
> ->iaid));
> +        if (lease->mac)
> +            rb_hash_aset(hash, rb_str_new2("mac"), rb_str_new2(lease
> ->mac));
> +        if (lease->iaid)
> +            rb_hash_aset(hash, rb_str_new2("iaid"),
> rb_str_new2(lease->iaid));
>          rb_hash_aset(hash, rb_str_new2("ipaddr"), rb_str_new2(lease
> ->ipaddr));
>          rb_hash_aset(hash, rb_str_new2("prefix"), UINT2NUM(lease
> ->prefix));
> -        rb_hash_aset(hash, rb_str_new2("hostname"),
> -                     rb_str_new2(lease->hostname));
> -        rb_hash_aset(hash, rb_str_new2("clientid"),
> -                     rb_str_new2(lease->clientid));
> +        if (lease->hostname) {
> +            rb_hash_aset(hash, rb_str_new2("hostname"),
> +                         rb_str_new2(lease->hostname));
> +        }
> +        if (lease->clientid) {
> +            rb_hash_aset(hash, rb_str_new2("clientid"),
> +                         rb_str_new2(lease->clientid));
> +        }
>  
>          rb_ary_store(result, i, hash);
>      }