[Python-checkins] r46806 - in python/trunk: Lib/test/crashers/infinite_rec_3.py Lib/test/test_descr.py Misc/NEWS Objects/abstract.c
brett.cannon
python-checkins at python.org
Sat Jun 10 00:31:24 CEST 2006
Author: brett.cannon
Date: Sat Jun 10 00:31:23 2006
New Revision: 46806
Removed:
python/trunk/Lib/test/crashers/infinite_rec_3.py
Modified:
python/trunk/Lib/test/test_descr.py
python/trunk/Misc/NEWS
python/trunk/Objects/abstract.c
Log:
An object with __call__ as an attribute, when called, will have that attribute checked for __call__ itself, and will continue to look until it finds an object without the attribute. This can lead to an infinite recursion.
Closes bug #532646, again. Will be backported.
Deleted: /python/trunk/Lib/test/crashers/infinite_rec_3.py
==============================================================================
--- /python/trunk/Lib/test/crashers/infinite_rec_3.py Sat Jun 10 00:31:23 2006
+++ (empty file)
@@ -1,9 +0,0 @@
-
-# http://python.org/sf/1202533
-
-class A(object):
- pass
-A.__call__ = A()
-
-if __name__ == '__main__':
- A()() # segfault: infinite recursion in C
Modified: python/trunk/Lib/test/test_descr.py
==============================================================================
--- python/trunk/Lib/test/test_descr.py (original)
+++ python/trunk/Lib/test/test_descr.py Sat Jun 10 00:31:23 2006
@@ -3171,6 +3171,21 @@
list.__init__(a, sequence=[0, 1, 2])
vereq(a, [0, 1, 2])
+def recursive__call__():
+ if verbose: print ("Testing recursive __call__() by setting to instance of "
+ "class ...")
+ class A(object):
+ pass
+
+ A.__call__ = A()
+ try:
+ A()()
+ except RuntimeError:
+ pass
+ else:
+ raise TestFailed("Recursion limit should have been reached for "
+ "__call__()")
+
def delhook():
if verbose: print "Testing __del__ hook..."
log = []
@@ -4164,6 +4179,7 @@
buffer_inherit()
str_of_str_subclass()
kwdargs()
+ recursive__call__()
delhook()
hashinherit()
strops()
Modified: python/trunk/Misc/NEWS
==============================================================================
--- python/trunk/Misc/NEWS (original)
+++ python/trunk/Misc/NEWS Sat Jun 10 00:31:23 2006
@@ -12,6 +12,12 @@
Core and builtins
-----------------
+- Bug #532646: object.__call__() will continue looking for the __call__
+ attribute on objects until one without one is found. This leads to recursion
+ when you take a class and set its __call__ attribute to an instance of the
+ class. Originally fixed for classic classes, but this fix is for new-style.
+ Removes the infinite_rec_3 crasher.
+
- The string and unicode methods startswith() and endswith() now accept
a tuple of prefixes/suffixes to look for. Implements RFE #1491485.
Modified: python/trunk/Objects/abstract.c
==============================================================================
--- python/trunk/Objects/abstract.c (original)
+++ python/trunk/Objects/abstract.c Sat Jun 10 00:31:23 2006
@@ -1790,7 +1790,15 @@
ternaryfunc call;
if ((call = func->ob_type->tp_call) != NULL) {
+ /* slot_tp_call() will be called and ends up calling
+ PyObject_Call() if the object returned for __call__ has
+ __call__ itself defined upon it. This can be an infinite
+ recursion if you set __call__ in a class to an instance of
+ it. */
+ if (Py_EnterRecursiveCall(" in __call__"))
+ return NULL;
PyObject *result = (*call)(func, arg, kw);
+ Py_LeaveRecursiveCall();
if (result == NULL && !PyErr_Occurred())
PyErr_SetString(
PyExc_SystemError,
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