Fix T96032: add null check to constraint operators

The constraint operators for delete, apply, copy and copy to selected
were missing null checks and could crash blender when called wrongly
from the python api.

Differential Revision: http://developer.blender.org/D14195

1 files changed, 20 insertions, 0 deletions

diff --git a/source/blender/editors/object/object_constraint.c b/source/blender/editors/object/object_constraint.c
index d717271b9cb..3f4ed27a175 100644
--- a/source/blender/editors/object/object_constraint.c
+++ b/source/blender/editors/object/object_constraint.c
@@ -1443,6 +1443,11 @@ static int constraint_delete_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   Object *ob = ED_object_active_context(C);
   bConstraint *con = edit_constraint_property_get(C, op, ob, 0);
+
+  if (con == NULL) {
+    return OPERATOR_CANCELLED;
+  }
+
   ListBase *lb = ED_object_constraint_list_from_constraint(ob, con, NULL);
 
   /* Store name temporarily for report. */
@@ -1510,6 +1515,11 @@ static int constraint_apply_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   Object *ob = ED_object_active_context(C);
   bConstraint *con = edit_constraint_property_get(C, op, ob, 0);
+
+  if (con == NULL) {
+    return OPERATOR_CANCELLED;
+  }
+
   bPoseChannel *pchan;
   ListBase *constraints = ED_object_constraint_list_from_constraint(ob, con, &pchan);
 
@@ -1602,6 +1612,11 @@ static int constraint_copy_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   Object *ob = ED_object_active_context(C);
   bConstraint *con = edit_constraint_property_get(C, op, ob, 0);
+
+  if (con == NULL) {
+    return OPERATOR_CANCELLED;
+  }
+
   bPoseChannel *pchan;
   ListBase *constraints = ED_object_constraint_list_from_constraint(ob, con, &pchan);
 
@@ -1682,6 +1697,11 @@ static int constraint_copy_to_selected_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   Object *obact = ED_object_active_context(C);
   bConstraint *con = edit_constraint_property_get(C, op, obact, 0);
+
+  if (con == NULL) {
+    return OPERATOR_CANCELLED;
+  }
+
   bPoseChannel *pchan;
   ED_object_constraint_list_from_constraint(obact, con, &pchan);