Bug 1296297 - prevent integer overflow in QuotaManager::EnsureOriginIsInitialized. r=janv

MozReview-Commit-ID: KPYheDCdLa1

dom/quota/ActorsParent.cpp

@@ -4437,7 +4437,7 @@ QuotaManager::EnsureOriginIsInitialized(PersistenceType aPersistenceType,
     }
 
     if (gFixedLimitKB >= 0) {
-      mTemporaryStorageLimit = gFixedLimitKB * 1024;
+      mTemporaryStorageLimit = static_cast<uint64_t>(gFixedLimitKB) * 1024;
     }
     else {
       nsCOMPtr<nsIFile> storageDir =