Improve consistency of locking for SOG.m_parts in order to avoid race conditions in linking and unlinking

1 files changed, 4 insertions, 2 deletions

diff --git a/OpenSim/Region/CoreModules/Framework/InventoryAccess/InventoryAccessModule.cs b/OpenSim/Region/CoreModules/Framework/InventoryAccess/InventoryAccessModule.cs
index eef0c73..6decf54 100644
--- a/OpenSim/Region/CoreModules/Framework/InventoryAccess/InventoryAccessModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/InventoryAccess/InventoryAccessModule.cs
@@ -526,7 +526,7 @@ namespace OpenSim.Region.CoreModules.Framework.InventoryAccess
                         group.RootPart.CreateSelected = true;
 
                     if (!m_Scene.Permissions.CanRezObject(
-                        group.Children.Count, remoteClient.AgentId, pos)
+                        group.PrimCount, remoteClient.AgentId, pos)
                         && !attachment)
                     {
                         // The client operates in no fail mode. It will
@@ -594,7 +594,9 @@ namespace OpenSim.Region.CoreModules.Framework.InventoryAccess
                     rootPart.Name = item.Name;
                     rootPart.Description = item.Description;
 
-                    List<SceneObjectPart> partList = new List<SceneObjectPart>(group.Children.Values);
+                    List<SceneObjectPart> partList = null;                    
+                    lock (group.Children)
+                        partList = new List<SceneObjectPart>(group.Children.Values);
 
                     group.SetGroup(remoteClient.ActiveGroupId, remoteClient);
                     if ((rootPart.OwnerID != item.Owner) || (item.CurrentPermissions & 16) != 0)