diff --git a/test_conformance/mem_host_flags/checker_image_mem_host_no_access.hpp b/test_conformance/mem_host_flags/checker_image_mem_host_no_access.hpp
index b1960ba4..bcbb0616 100644
--- a/test_conformance/mem_host_flags/checker_image_mem_host_no_access.hpp
+++ b/test_conformance/mem_host_flags/checker_image_mem_host_no_access.hpp
@@ -51,6 +51,7 @@ cl_int cImage_check_mem_host_no_access<T>:: verify_RW_Image()
                           &color,
                           img_orig, img_region,
                           0, NULL, &event);
+  test_error(err, "clEnqueueFillImage error");
 
   if (!this->m_blocking) {
     err = clWaitForEvents(1, &event);
diff --git a/test_conformance/mem_host_flags/checker_mem_host_read_only.hpp b/test_conformance/mem_host_flags/checker_mem_host_read_only.hpp
index 669f3601..65a828c9 100644
--- a/test_conformance/mem_host_flags/checker_mem_host_read_only.hpp
+++ b/test_conformance/mem_host_flags/checker_mem_host_read_only.hpp
@@ -57,7 +57,7 @@ cl_int cBuffer_check_mem_host_read_only< T >::SetupBuffer()
                                   block_size_in_byte, this->host_m_1.pData, &err);
   test_error(err, "clCreateBuffer error");
 
-  if (this->buffer_mem_flag | CL_MEM_USE_HOST_PTR)
+  if (this->buffer_mem_flag & CL_MEM_USE_HOST_PTR)
   {
     this->pHost_ptr = (void *)this->host_m_1.pData;
   }
@@ -235,6 +235,7 @@ cl_int cBuffer_check_mem_host_read_only< T >::verify_RW_Buffer_mapping()
 
   if ((this->buffer_mem_flag & CL_MEM_USE_HOST_PTR) && dataPtr != this->pHost_ptr ) {
     log_error("Mapped host pointer difference found\n");
+    return FAILURE;
   }
 
   if(!this->host_m_1.Equal((T*)dataPtr, this->m_nNumber_elements)) {
diff --git a/test_conformance/mem_host_flags/checker_mem_host_write_only.hpp b/test_conformance/mem_host_flags/checker_mem_host_write_only.hpp
index 04c82a8e..a2153492 100644
--- a/test_conformance/mem_host_flags/checker_mem_host_write_only.hpp
+++ b/test_conformance/mem_host_flags/checker_mem_host_write_only.hpp
@@ -192,6 +192,7 @@ cl_int cBuffer_check_mem_host_write_only< T >::verify_RW_Buffer_rect()
   err = clEnqueueWriteBuffer(this->m_queue, this->m_buffer, CL_TRUE, 0,
                              this->get_block_size_bytes(), tmp_host_m.pData,
                              0, NULL, &event_1);
+  test_error(err, "clEnqueueWriteBuffer error");
 
   vv1 = TEST_VALUE;
   tmp_host_m.Set_to(vv1);
@@ -205,7 +206,7 @@ cl_int cBuffer_check_mem_host_write_only< T >::verify_RW_Buffer_rect()
                                  this->host_slice_pitch_bytes,
                                  tmp_host_m.pData,
                                  1, &event_1, &event);
-  test_error(err, "clEnqueueWriteBuffer error");
+  test_error(err, "clEnqueueWriteBufferRect error");
 
   if (!this->m_blocking) {
     err = clWaitForEvents(1, &event);
@@ -265,6 +266,7 @@ cl_int cBuffer_check_mem_host_write_only< T >::update_host_mem_2()
   cl_event event, event_2;
   cl_int err = clEnqueueCopyBuffer(this->m_queue, this->m_buffer, this->m_buffer2, 0, 0,
                                    this->m_nNumber_elements* sizeof (T), 0, NULL, &event);
+  test_error(err, "clEnqueueCopyBuffer error");
 
   this->host_m_2.Set_to_zero();
   err = clEnqueueReadBuffer(this->m_queue, this->m_buffer2, CL_TRUE, 0,