virNWFilterObjListFree: Prevent null pointer derefernce

Allow virNWFilterObjListFree to be called with a NULL argument.
This enables a later patch to use virNWFilterObjListFree as a
cleanup function safely, as it is a no-op if virNWFilterObj was
not yet initialized.

Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

diff --git a/src/conf/virnwfilterobj.c b/src/conf/virnwfilterobj.c
index e9bb2b181153fe0ca7c5e6f0e1857fd224de4278..f9c1b049d562f902706b6685e6c94ef306191098 100644 (file)
--- a/src/conf/virnwfilterobj.c
+++ b/src/conf/virnwfilterobj.c
@@ -110,6 +110,9 @@ virNWFilterObjFree(virNWFilterObj *obj)
 void
 virNWFilterObjListFree(virNWFilterObjList *nwfilters)
 {
+    if (!nwfilters)
+        return;
+
     g_hash_table_unref(nwfilters->objs);
     g_hash_table_unref(nwfilters->objsName);
     g_free(nwfilters);