Index: /trunk/src/VBox/Additions/WINNT/SharedFolders/driver/info.cpp
===================================================================
--- /trunk/src/VBox/Additions/WINNT/SharedFolders/driver/info.cpp	(revision 78532)
+++ /trunk/src/VBox/Additions/WINNT/SharedFolders/driver/info.cpp	(revision 78533)
@@ -679,5 +679,8 @@
             memcpy(pInfo->VolumeLabel, VBOX_VOLNAME_PREFIX, RT_MIN(cbLeft, VBOX_VOLNAME_PREFIX_SIZE));
             if (cbLeft > VBOX_VOLNAME_PREFIX_SIZE)
-                memcpy(&pInfo->VolumeLabel[VBOX_VOLNAME_PREFIX_SIZE / sizeof(WCHAR)], pwcShareName, cbShareName);
+            {
+                cbLeft -= VBOX_VOLNAME_PREFIX_SIZE;
+                memcpy(&pInfo->VolumeLabel[VBOX_VOLNAME_PREFIX_SIZE / sizeof(WCHAR)], pwcShareName, RT_MIN(cbLeft, cbShareName));
+            }
             Log(("VBOXSF: VBoxMRxQueryVolumeInfo: FileFsVolumeInformation: partial result (%#x, needed %#x)\n",
                  cbCopied, cbCopied + cbVolLabel));