P4 to Git Change 1546206 by gandryey@gera-w8 on 2018/04/25 11:32:37

SWDEV-151852 - [CQE OCL][DTB-BLOCKER][VEGA10][WIN][LNX][QR] Observed crash while running Multiple device context test due to FAULTY CL#1544622
	- Add a check for nullptr in case if virtual device object was destroyed before memory allocation

Affected files ...

... //depot/stg/opencl/drivers/opencl/runtime/device/pal/palconstbuf.cpp#10 edit

rocclr/runtime/device/pal/palconstbuf.cpp

@@ -21,7 +21,7 @@ ManagedBuffer::ManagedBuffer(VirtualGPU& gpu, uint32_t size)
 // ================================================================================================
 void ManagedBuffer::release() {
   for (auto it : buffers_) {
-    if (it->data() != nullptr) {
+    if ((it != nullptr) && (it->data() != nullptr)) {
       it->unmap(&gpu_);
     }
     delete it;