Fix 114336: Cycles crash switching render pass in the viewport

intern/cycles/integrator/path_trace_tile.cpp

@@ -54,6 +54,11 @@ bool PathTraceTile::get_pass_pixels(const string_view pass_name,
   }
 
   pass = buffer_params.get_actual_display_pass(pass);
+  if (pass == nullptr) {
+    /* Happens when interactive sesssion changes display pass but render
+     * buffer does not contain it yet. */
+    return false;
+  }
 
   const float exposure = buffer_params.exposure;
   const int num_samples = path_trace_.get_num_render_tile_samples();

intern/cycles/integrator/path_trace_work.cpp

@@ -154,6 +154,11 @@ PassAccessor::PassAccessInfo PathTraceWork::get_display_pass_access_info(PassMod
   const BufferParams &params = buffers_->params;
 
   const BufferPass *display_pass = params.get_actual_display_pass(film_->get_display_pass());
+  if (display_pass == nullptr) {
+    /* Happens when interactive sesssion changes display pass but render
+     * buffer does not contain it yet. */
+    return PassAccessor::PassAccessInfo();
+  }
 
   PassAccessor::PassAccessInfo pass_access_info;
   pass_access_info.type = display_pass->type;

intern/cycles/integrator/path_trace_work_cpu.cpp

@@ -176,6 +176,9 @@ void PathTraceWorkCPU::copy_to_display(PathTraceDisplay *display,
   const KernelFilm &kfilm = device_scene_->data.film;
 
   const PassAccessor::PassAccessInfo pass_access_info = get_display_pass_access_info(pass_mode);
+  if (pass_access_info.type == PASS_NONE) {
+    return;
+  }
 
   const PassAccessorCPU pass_accessor(pass_access_info, kfilm.exposure, num_samples);
 

intern/cycles/integrator/path_trace_work_gpu.cpp

@@ -1025,6 +1025,10 @@ void PathTraceWorkGPU::get_render_tile_film_pixels(const PassAccessor::Destinati
   const KernelFilm &kfilm = device_scene_->data.film;
 
   const PassAccessor::PassAccessInfo pass_access_info = get_display_pass_access_info(pass_mode);
+  if (pass_access_info.type == PASS_NONE) {
+    return;
+  }
+
   const PassAccessorGPU pass_accessor(queue_.get(), pass_access_info, kfilm.exposure, num_samples);
 
   pass_accessor.get_render_tile_pixels(buffers_.get(), effective_buffer_params_, destination);