libxl_driver: Resolve Coverity errors

1. The virObjectLock() call was unconditional, but Unlock was conditional
   on vm being valid.  Removed the check

2. A call to virDomainEventNewFromObj() isn't guaranteed to return an
   event - that check needs to be made prior to libxlDomainEventQueue()
   of the event. Did not add libxlDriverLock/Unlock around the call since
   some callers already have lock taken

3. Need to initialize fd = -1 in libxlDoDomainSave() since we can jump
   to cleanup before it's set.

4. Missing break;'s in libxlDomainModifyDeviceFlags() for case
   LIBXL_DEVICE_UPDATE.  The default: case would report an error

diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 22bd2457cc388fe79f4401c3e7d7cf5ecf221c60..35c9e16de2a1b06dc71be0e4775c50b9427df9d1 100644 (file)
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -455,8 +455,7 @@ libxlAutostartDomain(virDomainObjPtr vm,
 
     ret = 0;
 cleanup:
-    if (vm)
-        virObjectUnlock(vm);
+    virObjectUnlock(vm);
     return ret;
 }
 
@@ -983,7 +982,8 @@ libxlVmStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
                                      restore_fd < 0 ?
                                          VIR_DOMAIN_EVENT_STARTED_BOOTED :
                                          VIR_DOMAIN_EVENT_STARTED_RESTORED);
-    libxlDomainEventQueue(driver, event);
+    if (event)
+        libxlDomainEventQueue(driver, event);
 
     libxl_domain_config_dispose(&d_config);
     VIR_FREE(dom_xml);
@@ -2085,7 +2085,7 @@ libxlDoDomainSave(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
     virDomainEventPtr event = NULL;
     char *xml = NULL;
     uint32_t xml_len;
-    int fd;
+    int fd = -1;
     int ret = -1;
 
     if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_PAUSED) {
@@ -3561,6 +3561,7 @@ libxlDomainModifyDeviceFlags(virDomainPtr dom, const char *xml,
                 break;
             case LIBXL_DEVICE_UPDATE:
                 ret = libxlDomainUpdateDeviceConfig(vmdef, dev);
+                break;
             default:
                 virReportError(VIR_ERR_INTERNAL_ERROR,
                                _("unknown domain modify action %d"), action);
@@ -3585,6 +3586,7 @@ libxlDomainModifyDeviceFlags(virDomainPtr dom, const char *xml,
                 break;
             case LIBXL_DEVICE_UPDATE:
                 ret = libxlDomainUpdateDeviceLive(priv, vm, dev);
+                break;
             default:
                 virReportError(VIR_ERR_INTERNAL_ERROR,
                                _("unknown domain modify action %d"), action);