Fix T76538: Prevent nodesocket creation on certain nodes

- no sockets on Frame nodes
- no Input sockets on Group Input nodes
- no Output sockets on Group Output nodes

Maniphest Tasks: T76538

Differential Revision: https://developer.blender.org/D7671

2 files changed, 13 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index c3c538f3424..5ae44247e13 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -771,6 +771,10 @@ bNodeSocket *nodeAddSocket(bNodeTree *ntree,
                            const char *identifier,
                            const char *name)
 {
+  BLI_assert(node->type != NODE_FRAME);
+  BLI_assert(!(in_out == SOCK_IN && node->type == NODE_GROUP_INPUT));
+  BLI_assert(!(in_out == SOCK_OUT && node->type == NODE_GROUP_OUTPUT));
+
   ListBase *lb = (in_out == SOCK_IN ? &node->inputs : &node->outputs);
   bNodeSocket *sock = make_socket(ntree, node, in_out, lb, idname, identifier, name);
 
diff --git a/source/blender/makesrna/intern/rna_nodetree.c b/source/blender/makesrna/intern/rna_nodetree.c
index 71b3f1ee94b..5be3db37329 100644
--- a/source/blender/makesrna/intern/rna_nodetree.c
+++ b/source/blender/makesrna/intern/rna_nodetree.c
@@ -1893,6 +1893,11 @@ static bNodeSocket *rna_Node_inputs_new(ID *id,
                                         const char *name,
                                         const char *identifier)
 {
+
+  if (ELEM(node->type, NODE_GROUP_INPUT, NODE_FRAME)) {
+    BKE_report(reports, RPT_ERROR, "Unable to create socket");
+    return NULL;
+  }
   /* Adding an input to a group node is not working,
    * simpler to add it to its underlying nodetree. */
   if (ELEM(node->type, NODE_GROUP, NODE_CUSTOM_GROUP) && node->id != NULL) {
@@ -1923,6 +1928,10 @@ static bNodeSocket *rna_Node_outputs_new(ID *id,
                                          const char *name,
                                          const char *identifier)
 {
+  if (ELEM(node->type, NODE_GROUP_OUTPUT, NODE_FRAME)) {
+    BKE_report(reports, RPT_ERROR, "Unable to create socket");
+    return NULL;
+  }
   /* Adding an output to a group node is not working,
    * simpler to add it to its underlying nodetree. */
   if (ELEM(node->type, NODE_GROUP, NODE_CUSTOM_GROUP) && node->id != NULL) {