[SYCL] Fix warnings from static analysis tool (#2193)

Signed-off-by: Alexander Batashev <[email protected]>

Author: Alexander Batashev

sycl/plugins/level_zero/pi_level0.cpp

@@ -2258,6 +2258,8 @@ piEnqueueKernelLaunch(pi_queue Queue, pi_kernel Kernel, pi_uint32 WorkDim,
 
   ze_event_handle_t *ZeEventWaitList =
       _pi_event::createZeEventList(NumEventsInWaitList, EventWaitList);
+  if (!ZeEventWaitList)
+    return PI_OUT_OF_HOST_MEMORY;
 
   // Add the command to the command list
   ZE_CALL(zeCommandListAppendLaunchKernel(
@@ -2708,6 +2710,8 @@ enqueueMemCopyHelper(pi_command_type CommandType, pi_queue Queue, void *Dst,
 
   ze_event_handle_t *ZeEventWaitList =
       _pi_event::createZeEventList(NumEventsInWaitList, EventWaitList);
+  if (!ZeEventWaitList)
+    return PI_OUT_OF_HOST_MEMORY;
 
   ZE_CALL(zeCommandListAppendWaitOnEvents(ZeCommandList, NumEventsInWaitList,
                                           ZeEventWaitList));
@@ -2766,6 +2770,8 @@ static pi_result enqueueMemCopyRectHelper(
 
   ze_event_handle_t *ZeEventWaitList =
       _pi_event::createZeEventList(NumEventsInWaitList, EventWaitList);
+  if (!ZeEventWaitList)
+    return PI_OUT_OF_HOST_MEMORY;
 
   ZE_CALL(zeCommandListAppendWaitOnEvents(ZeCommandList, NumEventsInWaitList,
                                           ZeEventWaitList));
@@ -2926,6 +2932,8 @@ enqueueMemFillHelper(pi_command_type CommandType, pi_queue Queue, void *Ptr,
 
   ze_event_handle_t *ZeEventWaitList =
       _pi_event::createZeEventList(NumEventsInWaitList, EventWaitList);
+  if (!ZeEventWaitList)
+    return PI_OUT_OF_HOST_MEMORY;
 
   ZE_CALL(zeCommandListAppendWaitOnEvents(ZeCommandList, NumEventsInWaitList,
                                           ZeEventWaitList));

sycl/source/detail/program_impl.cpp

@@ -399,7 +399,7 @@ bool program_impl::has_cl_kernel(const string_class &KernelName) const {
 }
 
 RT::PiKernel program_impl::get_pi_kernel(const string_class &KernelName) const {
-  RT::PiKernel Kernel;
+  RT::PiKernel Kernel = nullptr;
 
   if (is_cacheable()) {
     std::tie(Kernel, std::ignore) =

sycl/source/detail/scheduler/graph_builder.cpp

@@ -93,6 +93,7 @@ Scheduler::GraphBuilder::GraphBuilder() {
 }
 
 static bool markNodeAsVisited(Command *Cmd, std::vector<Command *> &Visited) {
+  assert(Cmd && "Cmd can't be nullptr");
   if (Cmd->MMarks.MVisited)
     return false;
   Cmd->MMarks.MVisited = true;