layers: Fix crash when sub cb state doesn't have render pass

Author: ziga-lunarg

layers/core_checks/cc_cmd_buffer.cpp

@@ -886,7 +886,7 @@ bool CoreChecks::PreCallValidateCmdExecuteCommands(VkCommandBuffer commandBuffer
         } else {
             if (cb_state.activeRenderPass) {
                 if (cb_state.hasRenderPassInstance && cb_state.activeRenderPass->UsesDynamicRendering() &&
-                    sub_cb_state.activeRenderPass->UsesDynamicRendering()) {
+                    sub_cb_state.activeRenderPass && sub_cb_state.activeRenderPass->UsesDynamicRendering()) {
                     const auto *location_info = vku::FindStructInPNextChain<VkRenderingAttachmentLocationInfo>(
                         sub_cb_state.activeRenderPass->inheritance_rendering_info.pNext);
 

layers/core_checks/cc_render_pass.cpp

@@ -4084,7 +4084,8 @@ bool CoreChecks::ValidateCmdSubpassState(const vvl::CommandBuffer &cb_state, con
          loc.function != Func::vkCmdEndRenderPass && loc.function != Func::vkCmdNextSubpass2 &&
          loc.function != Func::vkCmdNextSubpass2KHR && loc.function != Func::vkCmdEndRenderPass2 &&
          loc.function != Func::vkCmdEndRenderPass2KHR)) {
-        skip |= LogError(vuid, cb_state.Handle(), loc, "cannot be called in a subpass using secondary command buffers.");
+        skip |= LogError(vuid, cb_state.Handle(), loc,
+                         "cannot be called in a subpass using VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS.");
     }
     return skip;
 }