[Python-checkins] cpython (2.7): check for string attribute names in old-style classes (closes #14334)

[benjamin.peterson]

http://hg.python.org/cpython/rev/3d4d52e47431
changeset:   75745:3d4d52e47431
branch:      2.7
parent:      75740:d1cf6008a565
user:        Benjamin Peterson <benjamin at python.org>
date:        Fri Mar 16 10:58:46 2012 -0500
summary:
  check for string attribute names in old-style classes (closes #14334)

files:
  Lib/test/test_class.py |   7 +++++++
  Misc/NEWS              |   3 ++-
  Objects/classobject.c  |  30 +++++++++++++++++++++++++++---
  3 files changed, 36 insertions(+), 4 deletions(-)


diff --git a/Lib/test/test_class.py b/Lib/test/test_class.py
--- a/Lib/test/test_class.py
+++ b/Lib/test/test_class.py
@@ -628,6 +628,13 @@
         a = A(hash(A.f.im_func)^(-1))
         hash(a.f)
 
+    def testAttrSlots(self):
+        class C:
+            pass
+        for c in C, C():
+            self.assertRaises(TypeError, type(c).__getattribute__, c, [])
+            self.assertRaises(TypeError, type(c).__setattr__, c, [], [])
+
 def test_main():
     with test_support.check_py3k_warnings(
             (".+__(get|set|del)slice__ has been removed", DeprecationWarning),
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,7 +10,8 @@
 -----------------
 
 - Issue #14334: Prevent in a segfault in type.__getattribute__ when it was not
-  passed strings.
+  passed strings. Also fix segfaults in the __getattribute__ and __setattr__
+  methods of old-style classes.
 
 - Issue #14161: fix the __repr__ of file objects to escape the file name.
 
diff --git a/Objects/classobject.c b/Objects/classobject.c
--- a/Objects/classobject.c
+++ b/Objects/classobject.c
@@ -225,10 +225,16 @@
 class_getattr(register PyClassObject *op, PyObject *name)
 {
     register PyObject *v;
-    register char *sname = PyString_AsString(name);
+    register char *sname;
     PyClassObject *klass;
     descrgetfunc f;
 
+    if (!PyString_Check(name)) {
+        PyErr_SetString(PyExc_TypeError, "attribute name must be a string");
+        return NULL;
+    }
+
+    sname = PyString_AsString(name);
     if (sname[0] == '_' && sname[1] == '_') {
         if (strcmp(sname, "__dict__") == 0) {
             if (PyEval_GetRestricted()) {
@@ -336,6 +342,10 @@
                    "classes are read-only in restricted mode");
         return -1;
     }
+    if (!PyString_Check(name)) {
+        PyErr_SetString(PyExc_TypeError, "attribute name must be a string");
+        return -1;
+    }
     sname = PyString_AsString(name);
     if (sname[0] == '_' && sname[1] == '_') {
         Py_ssize_t n = PyString_Size(name);
@@ -699,7 +709,14 @@
 instance_getattr1(register PyInstanceObject *inst, PyObject *name)
 {
     register PyObject *v;
-    register char *sname = PyString_AsString(name);
+    register char *sname;
+
+    if (!PyString_Check(name)) {
+        PyErr_SetString(PyExc_TypeError, "attribute name must be a string");
+        return NULL;
+    }
+
+    sname = PyString_AsString(name);
     if (sname[0] == '_' && sname[1] == '_') {
         if (strcmp(sname, "__dict__") == 0) {
             if (PyEval_GetRestricted()) {
@@ -810,7 +827,14 @@
 instance_setattr(PyInstanceObject *inst, PyObject *name, PyObject *v)
 {
     PyObject *func, *args, *res, *tmp;
-    char *sname = PyString_AsString(name);
+    char *sname;
+
+    if (!PyString_Check(name)) {
+        PyErr_SetString(PyExc_TypeError, "attribute name must be a string");
+        return -1;
+    }
+
+    sname = PyString_AsString(name);
     if (sname[0] == '_' && sname[1] == '_') {
         Py_ssize_t n = PyString_Size(name);
         if (sname[n-1] == '_' && sname[n-2] == '_') {

-- 
Repository URL: http://hg.python.org/cpython