check some bounds conditions

Change-Id: Iab2f715b37d9fae816723b84ee1116fd4aff9537

filter/source/msfilter/msdffimp.cxx

@@ -5884,6 +5884,11 @@ void SvxMSDffManager::GetFidclData( sal_uInt32 nOffsDggL )
                         "escher", "FIDCL list longer than remaining bytes, ppt or parser is wrong");
                     mnIdClusters = std::min(nMaxEntriesPossible, static_cast<sal_Size>(mnIdClusters));
 
+                    sal_Size nMaxEntriesAllocatable = SAL_MAX_UINT32 / sizeof(FIDCL);
+                    SAL_WARN_IF(nMaxEntriesAllocatable < mnIdClusters,
+                        "escher", "FIDCL list longer than can be allocated");
+                    mnIdClusters = std::min(nMaxEntriesAllocatable, static_cast<sal_Size>(mnIdClusters));
+
                     mpFidcls = new FIDCL[ mnIdClusters ];
                     memset(mpFidcls, 0, mnIdClusters * sizeof(FIDCL));
                     for (sal_uInt32 i = 0; i < mnIdClusters; ++i)