[libvirt] [PATCH] nwfilter: don't crash listing filters in unprivileged daemon

[Daniel P. Berrange]

The unprivileged libvirtd does not support nwfilter config, by leaves the
driver active. It is supposed to result in all APIs being an effective
no-op, but several APIs rely on driver->nwfilters being non-NULL, or they
will reference a NULL pointer. Rather than adding checks for NULL in many
places, just make sure  driver->nwfilters is always initialized.

Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
 src/nwfilter/nwfilter_driver.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/nwfilter/nwfilter_driver.c b/src/nwfilter/nwfilter_driver.c
index 2f9a51c405..89b767fe11 100644
--- a/src/nwfilter/nwfilter_driver.c
+++ b/src/nwfilter/nwfilter_driver.c
@@ -189,6 +189,8 @@ nwfilterStateInitialize(bool privileged,
     /* remember that we are going to use firewalld */
     driver->watchingFirewallD = (sysbus != NULL);
     driver->privileged = privileged;
+    if (!(driver->nwfilters = virNWFilterObjListNew()))
+        goto error;
 
     if (!privileged)
         return 0;
@@ -244,9 +246,6 @@ nwfilterStateInitialize(bool privileged,
         goto error;
     }
 
-    if (!(driver->nwfilters = virNWFilterObjListNew()))
-        goto error;
-
     if (virNWFilterObjListLoadAllConfigs(driver->nwfilters, driver->configDir) < 0)
         goto error;
 
@@ -271,6 +270,7 @@ nwfilterStateInitialize(bool privileged,
     virNWFilterIPAddrMapShutdown();
 
  err_free_driverstate:
+    virNWFilterObjListFree(driver->nwfilters);
     VIR_FREE(driver);
 
     return -1;
-- 
2.14.3