Fix #33804: Blender crash unlinking multilayer exr image in image node

source/blender/compositor/nodes/COM_ImageNode.cpp

@@ -28,6 +28,10 @@
 #include "BKE_node.h"
 #include "BLI_utildefines.h"
 
+#include "COM_SetValueOperation.h"
+#include "COM_SetVectorOperation.h"
+#include "COM_SetColorOperation.h"
+
 ImageNode::ImageNode(bNode *editorNode) : Node(editorNode)
 {
 	/* pass */
@@ -165,6 +169,46 @@ void ImageNode::convertToOperations(ExecutionSystem *graph, CompositorContext *c
 				graph->addOperation(depthOperation);
 			}
 		}
+		if (numberOfOutputs > 3) {
+			/* happens when unlinking image datablock from multilayer node */
+			for (int i = 3; i < numberOfOutputs; i++) {
+				OutputSocket *output = this->getOutputSocket(i);
+				NodeOperation *operation = NULL;
+				switch (output->getDataType()) {
+					case COM_DT_VALUE:
+					{
+						SetValueOperation *valueoperation = new SetValueOperation();
+						valueoperation->setValue(0.0f);
+						operation = valueoperation;
+						break;
+					}
+					case COM_DT_VECTOR:
+					{
+						SetVectorOperation *vectoroperation = new SetVectorOperation();
+						vectoroperation->setX(0.0f);
+						vectoroperation->setY(0.0f);
+						vectoroperation->setW(0.0f);
+						operation = vectoroperation;
+						break;
+					}
+					case COM_DT_COLOR:
+					{
+						SetColorOperation *coloroperation = new SetColorOperation();
+						coloroperation->setChannel1(0.0f);
+						coloroperation->setChannel2(0.0f);
+						coloroperation->setChannel3(0.0f);
+						coloroperation->setChannel4(0.0f);
+						operation = coloroperation;
+						break;
+					}
+				}
+
+				if (operation) {
+					output->relinkConnections(operation->getOutputSocket());
+					graph->addOperation(operation);
+				}
+			}
+		}
 	}
 }