[libvirt] [PATCH] conf: resctrl object is not properly handled

[Wang Huaqiang]

resctrl object stored in def->resctrls is shared by cachetune and
memorytune. The domain xml configuration is parsed firstly for
cachetune then memorytune, and the resctrl object will not be created
in parsing settings for memorytune once it found sharing exists.

But resctrl is improperly freed when sharing happens.

Signed-off-by: Wang Huaqiang <huaqiang.wang at intel.com>
---
 src/conf/domain_conf.c                    | 12 +++++-------
 tests/genericxml2xmlindata/memorytune.xml |  4 ++++
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 617ccac..604e006 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -19590,7 +19590,6 @@ virDomainMemorytuneDefParse(virDomainDefPtr def,
     VIR_AUTOUNREF(virResctrlAllocPtr) alloc = NULL;
     ssize_t i = 0;
     int n;
-    int ret = -1;
 
     ctxt->node = node;
 
@@ -19632,14 +19631,13 @@ virDomainMemorytuneDefParse(virDomainDefPtr def,
         if (!(resctrl = virDomainResctrlNew(node, alloc, vcpus, flags)))
             return -1;
 
-        if (VIR_APPEND_ELEMENT(def->resctrls, def->nresctrls, resctrl) < 0)
-            goto cleanup;
+        if (VIR_APPEND_ELEMENT(def->resctrls, def->nresctrls, resctrl) < 0) {
+            virDomainResctrlDefFree(resctrl);
+            return -1;
+        }
     }
 
-    ret = 0;
- cleanup:
-    virDomainResctrlDefFree(resctrl);
-    return ret;
+    return 0;
 }
 
 
diff --git a/tests/genericxml2xmlindata/memorytune.xml b/tests/genericxml2xmlindata/memorytune.xml
index ea03e22..7486b54 100644
--- a/tests/genericxml2xmlindata/memorytune.xml
+++ b/tests/genericxml2xmlindata/memorytune.xml
@@ -5,6 +5,10 @@
   <currentMemory unit='KiB'>219136</currentMemory>
   <vcpu placement='static'>4</vcpu>
   <cputune>
+    <cachetune vcpus='0-1'>
+      <cache id='0' level='3' type='both' size='768' unit='KiB'/>
+      <cache id='1' level='3' type='both' size='768' unit='KiB'/>
+    </cachetune>
     <memorytune vcpus='0-1'>
       <node id='0' bandwidth='20'/>
       <node id='1' bandwidth='30'/>
-- 
2.7.4