[OpenCL] Fix some unchecked dereferencing of optional params.

Author: aarongreig

source/adapters/opencl/kernel.cpp

@@ -199,7 +199,8 @@ urKernelGetSubGroupInfo(ur_kernel_handle_t hKernel, ur_device_handle_t hDevice,
     }
   }
 
-  *(static_cast<uint32_t *>(pPropValue)) = static_cast<uint32_t>(RetVal);
+  if (pPropValue)
+    *(static_cast<uint32_t *>(pPropValue)) = static_cast<uint32_t>(RetVal);
   if (pPropSizeRet)
     *pPropSizeRet = sizeof(uint32_t);
 

source/adapters/opencl/memory.cpp

@@ -268,9 +268,10 @@ UR_APIEXPORT ur_result_t UR_APICALL urMemBufferCreate(
     }
   }
 
+  void *HostPtr = pProperties ? pProperties->pHost : nullptr;
   *phBuffer = reinterpret_cast<ur_mem_handle_t>(clCreateBuffer(
       cl_adapter::cast<cl_context>(hContext), static_cast<cl_mem_flags>(flags),
-      size, pProperties->pHost, cl_adapter::cast<cl_int *>(&RetErr)));
+      size, HostPtr, cl_adapter::cast<cl_int *>(&RetErr)));
   CL_RETURN_ON_FAILURE(RetErr);
 
   return UR_RESULT_SUCCESS;