fix [#32490] Compsitor crashes on missing OpenEXR multilayer files

source/blender/compositor/intern/COM_Node.cpp

@@ -137,6 +137,21 @@ void Node::addSetVectorOperation(ExecutionSystem *graph, InputSocket *inputsocke
 	graph->addOperation(operation);
 }
 
+/* when a node has no valid data (missing image or group pointer) */
+void Node::convertToOperations_invalid(ExecutionSystem *graph, CompositorContext *context)
+{
+	/* this is a really bad situation - bring on the pink! - so artists know this is bad */
+	const float warning_color[4] = {1.0f, 0.0f, 1.0f, 1.0f};
+	int index;
+	vector<OutputSocket *> &outputsockets = this->getOutputSockets();
+	for (index = 0; index < outputsockets.size(); index++) {
+		SetColorOperation *operation = new SetColorOperation();
+		this->getOutputSocket(index)->relinkConnections(operation->getOutputSocket());
+		operation->setChannels(warning_color);
+		graph->addOperation(operation);
+	}
+}
+
 bNodeSocket *Node::getEditorInputSocket(int editorNodeInputSocketIndex)
 {
 	bNodeSocket *bSock = (bNodeSocket *)this->getbNode()->inputs.first;

source/blender/compositor/intern/COM_Node.h

@@ -99,6 +99,13 @@ public:
 	 */
 	void addSetVectorOperation(ExecutionSystem *graph, InputSocket *inputsocket, int editorNodeInputSocketIndex);
 	
+	/**
+	 * when a node has no valid data (missing image or a group nodes ID pointer is NULL)
+	 * call this function from #convertToOperations, this way the node sockets are converted
+	 * into valid outputs, without this the compositor system gets confused and crashes, see [#32490]
+	 */
+	void convertToOperations_invalid(ExecutionSystem *graph, CompositorContext *context);
+
 	/**
 	 * Creates a new link between an outputSocket and inputSocket and registrates the link to the graph
 	 * @return the new created link

source/blender/compositor/nodes/COM_GroupNode.cpp

@@ -33,16 +33,7 @@ GroupNode::GroupNode(bNode *editorNode) : Node(editorNode)
 void GroupNode::convertToOperations(ExecutionSystem *graph, CompositorContext *context)
 {
 	if (this->getbNode()->id == NULL) {
-		/* this is a really bad situation - bring on the pink! - so artists know this is bad */
-		const float warning_color[4] = {1.0f, 0.0f, 1.0f, 1.0f};
-		int index;
-		vector<OutputSocket *> &outputsockets = this->getOutputSockets();
-		for (index = 0; index < outputsockets.size(); index++) {
-			SetColorOperation *operation = new SetColorOperation();
-			this->getOutputSocket(index)->relinkConnections(operation->getOutputSocket());
-			operation->setChannels(warning_color);
-			graph->addOperation(operation);
-		}
+		convertToOperations_invalid(graph, context);
 	}
 }
 

source/blender/compositor/nodes/COM_ImageNode.cpp

@@ -72,12 +72,16 @@ void ImageNode::convertToOperations(ExecutionSystem *graph, CompositorContext *c
 
 	/* force a load, we assume iuser index will be set OK anyway */
 	if (image && image->type == IMA_TYPE_MULTILAYER) {
+		bool is_multilayer_ok = false;
 		BKE_image_get_ibuf(image, imageuser);
 		if (image->rr) {
 			RenderLayer *rl = (RenderLayer *)BLI_findlink(&image->rr->layers, imageuser->layer);
 			if (rl) {
 				OutputSocket *socket;
 				int index;
+
+				is_multilayer_ok = true;
+
 				for (index = 0; index < numberOfOutputs; index++) {
 					socket = this->getOutputSocket(index);
 					if (socket->isConnected() || index == 0) {
@@ -114,6 +118,11 @@ void ImageNode::convertToOperations(ExecutionSystem *graph, CompositorContext *c
 				}
 			}
 		}
+
+		/* without this, multilayer that fail to load will crash blender [#32490] */
+		if (is_multilayer_ok == false) {
+			convertToOperations_invalid(graph, context);
+		}
 	}
 	else {
 		if (numberOfOutputs >  0) {

source/blender/compositor/operations/COM_CompositorOperation.h

@@ -31,6 +31,9 @@
  */
 class CompositorOperation : public NodeOperation {
 private:
+	/**
+	 * @brief Scene name, used for getting the render output, includes 'SC' prefix.
+	 */
 	char m_sceneName[MAX_ID_NAME];
 
 	/**