Issue #24098: Fixed possible crash when AST is changed in process of
compiling it.
diff --git a/Parser/asdl_c.py b/Parser/asdl_c.py
index 3d46220..2bbd5a0 100755
--- a/Parser/asdl_c.py
+++ b/Parser/asdl_c.py
@@ -513,6 +513,13 @@
self.emit("res = obj2ast_%s(PyList_GET_ITEM(tmp, i), &value, arena);" %
field.type, depth+2, reflow=False)
self.emit("if (res != 0) goto failed;", depth+2)
+ self.emit("if (len != PyList_GET_SIZE(tmp)) {", depth+2)
+ self.emit("PyErr_SetString(PyExc_RuntimeError, \"%s field \\\"%s\\\" "
+ "changed size during iteration\");" %
+ (name, field.name),
+ depth+3, reflow=False)
+ self.emit("goto failed;", depth+3)
+ self.emit("}", depth+2)
self.emit("asdl_seq_SET(%s, i, value);" % field.name, depth+2)
self.emit("}", depth+1)
else: