Fix crash due to failure to unregister event callbacks in QEMU driver (David Lively)

ChangeLog

+Fri Nov 21 10:14:14 BST 2008 Daniel P. Berrange <berrange@redhat.com>
+
+	Fix crash due to failure to unregister event callbacks on
+	connection close (David Lively)
+	* src/domain_event.c, src/domain_event.h: Helper for unregistering
+	all callbacks
+	* src/qemu_driver.c: Unregister all callbacks on connection close
+
 Fri Nov 21 10:10:14 BST 2008 Daniel P. Berrange <berrange@redhat.com>
 
 	* src/Makefile.am: Include Xen compile flags for libvirt_driver.la

src/domain_event.c

@@ -87,6 +87,44 @@ virDomainEventCallbackListRemove(virConnectPtr conn,
     return -1;
 }
 
+/**
+ * virDomainEventCallbackListRemoveConn:
+ * @conn: pointer to the connection
+ * @cbList: the list
+ *
+ * Internal function to remove all of a given connection's callback
+ * from a virDomainEventCallbackListPtr
+ */
+int
+virDomainEventCallbackListRemoveConn(virConnectPtr conn,
+                                     virDomainEventCallbackListPtr cbList)
+{
+    int old_count = cbList->count;
+    int i;
+    for (i = 0 ; i < cbList->count ; i++) {
+        if(cbList->callbacks[i]->conn == conn) {
+            virFreeCallback freecb = cbList->callbacks[i]->freecb;
+            if (freecb)
+                (*freecb)(cbList->callbacks[i]->opaque);
+            virUnrefConnect(cbList->callbacks[i]->conn);
+            VIR_FREE(cbList->callbacks[i]);
+
+            if (i < (cbList->count - 1))
+                memmove(cbList->callbacks + i,
+                        cbList->callbacks + i + 1,
+                        sizeof(*(cbList->callbacks)) *
+                                (cbList->count - (i + 1)));
+            cbList->count--;
+            i--;
+        }
+    }
+    if (cbList->count < old_count &&
+        VIR_REALLOC_N(cbList->callbacks, cbList->count) < 0) {
+        ; /* Failure to reduce memory allocation isn't fatal */
+    }
+    return 0;
+}
+
 /**
  * virDomainEventCallbackListAdd:
  * @conn: pointer to the connection

src/domain_event.h

@@ -55,6 +55,9 @@ int virDomainEventCallbackListRemove(virConnectPtr conn,
                                      virDomainEventCallbackListPtr cbList,
                                      virConnectDomainEventCallback callback);
 
+int virDomainEventCallbackListRemoveConn(virConnectPtr conn,
+                                         virDomainEventCallbackListPtr cbList);
+
 /**
  * Dispatching domain events that come in while
  * in a call / response rpc

src/qemu_driver.c

@@ -1235,7 +1235,10 @@ static virDrvOpenStatus qemudOpen(virConnectPtr conn,
 }
 
 static int qemudClose(virConnectPtr conn) {
-    /*struct qemud_driver *driver = (struct qemud_driver *)conn->privateData;*/
+    struct qemud_driver *driver = (struct qemud_driver *)conn->privateData;
+
+    /* Get rid of callbacks registered for this conn */
+    virDomainEventCallbackListRemoveConn(conn, driver->domainEventCallbacks);
 
     conn->privateData = NULL;