2 files changed, 5 insertions, 0 deletions
diff --git a/src/H5Dselect.c b/src/H5Dselect.c
index 0ec3423..4ffce62 100644
--- a/src/H5Dselect.c
+++ b/src/H5Dselect.c
@@ -227,6 +227,8 @@ H5D__select_io(const H5D_io_info_t *io_info, size_t elmt_size,
 
             /* Decrement number of elements left to process */
             HDassert(((size_t)tmp_file_len % elmt_size) == 0);
+            if(elmt_size == 0)
+                HGOTO_ERROR(H5E_DATASPACE, H5E_BADVALUE, FAIL, "Resulted in division by zero")
             nelmts -= ((size_t)tmp_file_len / elmt_size);
         } /* end while */
     } /* end else */
diff --git a/src/H5I.c b/src/H5I.c
index ca9ff61..345c010 100644
--- a/src/H5I.c
+++ b/src/H5I.c
@@ -355,6 +355,9 @@ H5Itype_exists(H5I_type_t type)
     FUNC_ENTER_API(FAIL)
     H5TRACE1("t", "It", type);
 
+    if(H5I_IS_LIB_TYPE(type))
+        HGOTO_ERROR(H5E_ATOM, H5E_BADGROUP, FAIL, "cannot call public function on library type")
+
     if (type <= H5I_BADID || type >= H5I_next_type)
         HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, "invalid type number")