[libvirt] [PATCH] bhyve: fix virObjectUnlock() usage

[Roman Bogorodskiy]

In a number of places in the bhyve driver, virObjectUnlock()
is called with an arg without check if the arg is non-NULL, which
could result in passing NULL value and a warning like:

virObjectUnlock:340 : Object 0x0 ((unknown)) is not a virObjectLockable instance

* src/bhyve/bhyve_driver.c (bhyveDomainGetInfo)
(bhyveDomainGetState, bhyveDomainGetAutostart)
(bhyveDomainSetAutostart, bhyveDomainIsActive)
(bhyveDomainIsPersistent, bhyveDomainGetXMLDesc)
(bhyveDomainUndefine, bhyveDomainLookupByUUID)
(bhyveDomainLookupByName, bhyveDomainLookupByID)
(bhyveDomainCreateWithFlags, bhyveDomainOpenConsole):
Check if arg is not NULL before calling virObjectUnlock on it.
---
 src/bhyve/bhyve_driver.c | 39 ++++++++++++++++++++++++++-------------
 1 file changed, 26 insertions(+), 13 deletions(-)

diff --git a/src/bhyve/bhyve_driver.c b/src/bhyve/bhyve_driver.c
index 580b124..c8902bf 100644
--- a/src/bhyve/bhyve_driver.c
+++ b/src/bhyve/bhyve_driver.c
@@ -309,7 +309,8 @@ bhyveDomainGetInfo(virDomainPtr domain, virDomainInfoPtr info)
     ret = 0;
 
  cleanup:
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return ret;
 }
 
@@ -334,7 +335,8 @@ bhyveDomainGetState(virDomainPtr domain,
     ret = 0;
 
  cleanup:
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return ret;
 }
 
@@ -354,7 +356,8 @@ bhyveDomainGetAutostart(virDomainPtr domain, int *autostart)
     ret = 0;
 
  cleanup:
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return ret;
 }
 
@@ -417,7 +420,8 @@ bhyveDomainSetAutostart(virDomainPtr domain, int autostart)
  cleanup:
     VIR_FREE(configFile);
     VIR_FREE(autostartLink);
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return ret;
 }
 
@@ -436,7 +440,8 @@ bhyveDomainIsActive(virDomainPtr domain)
     ret = virDomainObjIsActive(obj);
 
  cleanup:
-    virObjectUnlock(obj);
+    if (obj)
+        virObjectUnlock(obj);
     return ret;
 }
 
@@ -455,7 +460,8 @@ bhyveDomainIsPersistent(virDomainPtr domain)
     ret = obj->persistent;
 
  cleanup:
-    virObjectUnlock(obj);
+    if (obj)
+        virObjectUnlock(obj);
     return ret;
 }
 
@@ -474,7 +480,8 @@ bhyveDomainGetXMLDesc(virDomainPtr domain, unsigned int flags)
     ret = virDomainDefFormat(vm->def, flags);
 
  cleanup:
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return ret;
 }
 
@@ -562,7 +569,8 @@ bhyveDomainUndefine(virDomainPtr domain)
     ret = 0;
 
  cleanup:
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return ret;
 }
 
@@ -730,7 +738,8 @@ bhyveDomainLookupByUUID(virConnectPtr conn,
         dom->id = vm->def->id;
 
  cleanup:
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return dom;
 }
 
@@ -757,7 +766,8 @@ static virDomainPtr bhyveDomainLookupByName(virConnectPtr conn,
         dom->id = vm->def->id;
 
  cleanup:
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return dom;
 }
 
@@ -785,7 +795,8 @@ bhyveDomainLookupByID(virConnectPtr conn,
         dom->id = vm->def->id;
 
  cleanup:
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return dom;
 }
 
@@ -820,7 +831,8 @@ bhyveDomainCreateWithFlags(virDomainPtr dom,
                                start_flags);
 
  cleanup:
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return ret;
 }
 
@@ -960,7 +972,8 @@ bhyveDomainOpenConsole(virDomainPtr dom,
     ret = 0;
 
  cleanup:
-    virObjectUnlock(vm);
+    if (vm)
+        virObjectUnlock(vm);
     return ret;
 }
 
-- 
1.9.0