epee: basic sanity check on allocation size from untrusted source

Reported by guidov

contrib/epee/include/storages/portable_storage_from_bin.h

@@ -136,6 +136,7 @@ namespace epee
       //for pod types
       array_entry_t<type_name> sa;
       size_t size = read_varint();
+      CHECK_AND_ASSERT_THROW_MES(size <= m_count, "Size sanity check failed");
       sa.reserve(size);
       //TODO: add some optimization here later
       while(size--)