[libvirt] [PATCH] xen: Resolve Coverity FORWARD_NULL issue

[Eric Blake]

On 05/23/2013 09:20 AM, John Ferlan wrote:
> Commit '18b14012' refactored the Xen code resulting in a Coverity
> warning about possible NULL reference if the path where the XM driver
> takes puts the def on it's list.  Moved/duplicated the virGetDomain()
> call to pacify the possible NULL deref.
> 
> NOTE: I did ping Dan B, but he is away, so rather than wait or take
> the chance this ends up in the upcoming release, I made the change.

Drop the NOTE when committing (it has bearing on the review, but not on
the patch contents, so it would have fit better after the ---).

> 
> ---
>  src/xen/xen_driver.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/src/xen/xen_driver.c b/src/xen/xen_driver.c
> index cc6e486..9eab3fc 100644
> --- a/src/xen/xen_driver.c
> +++ b/src/xen/xen_driver.c
> @@ -1658,13 +1658,14 @@ xenUnifiedDomainDefineXML(virConnectPtr conn, const char *xml)
>      if (priv->xendConfigVersion < XEND_CONFIG_VERSION_3_0_4) {
>          if (xenXMDomainDefineXML(conn, def) < 0)
>              goto cleanup;
> +        ret = virGetDomain(conn, def->name, def->uuid);
>          def = NULL; /* XM driver owns it now */
>      } else {
>          if (xenDaemonDomainDefineXML(conn, def) < 0)
>              goto cleanup;
> +        ret = virGetDomain(conn, def->name, def->uuid);
>      }
>  
> -    ret = virGetDomain(conn, def->name, def->uuid);

ACK; definite use-after-free fixup.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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