From ea2ef08e833524a58527e63499eacc2f64544499 Mon Sep 17 00:00:00 2001
From: "Michael W. Hudson" <mwh@python.net>
Date: Mon, 26 Sep 2005 13:15:34 +0000
Subject: Backport (with Anthony's blessing (in fact he reminded me to do it
 :)):

Patches #1298449 and #1298499: Add some missing checks for error
returns in cStringIO.c.  Thanks to Andrew Bennetts.

This must be a backport candidate.
---
 Lib/test/test_StringIO.py |  7 +++++++
 Misc/ACKS                 |  1 +
 Misc/NEWS                 |  3 +++
 Modules/cStringIO.c       | 21 +++++++++++++++------
 4 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/Lib/test/test_StringIO.py b/Lib/test/test_StringIO.py
index e74a427..c61f7cc 100644
--- a/Lib/test/test_StringIO.py
+++ b/Lib/test/test_StringIO.py
@@ -44,6 +44,13 @@ class TestGenericStringIO(unittest.TestCase):
         f.seek(0)
         self.assertEqual(f.getvalue(), 'abc')
 
+    def test_writelines_error(self):
+        def errorGen():
+            yield 'a'
+            raise KeyboardInterrupt()
+        f = self.MODULE.StringIO()
+        self.assertRaises(KeyboardInterrupt, f.writelines, errorGen())
+
     def test_truncate(self):
         eq = self.assertEqual
         f = self.MODULE.StringIO()
diff --git a/Misc/ACKS b/Misc/ACKS
index 3c59b4f..c599172 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -49,6 +49,7 @@ Reimer Behrends
 Thomas Bellman
 Juan M. Bello Rivas
 Alexander Belopolsky
+Andrew Bennetts
 Andy Bensky
 Michel Van den Bergh
 Eric Beser
diff --git a/Misc/NEWS b/Misc/NEWS
index cc2ac30..4d87425 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -16,6 +16,9 @@ Core and builtins
 Extension Modules
 -----------------
 
+- Patches #1298449 and #1298499: Add some missing checks for error
+  returns in cStringIO.c.
+
 - Patch #1297028: fix segfault if call type on MultibyteCodec,
   MultibyteStreamReader, or MultibyteStreamWriter.
 
diff --git a/Modules/cStringIO.c b/Modules/cStringIO.c
index b7333fd..e891114 100644
--- a/Modules/cStringIO.c
+++ b/Modules/cStringIO.c
@@ -241,7 +241,10 @@ IO_readlines(IOobject *self, PyObject *args) {
 		line = PyString_FromStringAndSize (output, n);
 		if (!line) 
                         goto err;
-		PyList_Append (result, line);
+		if (PyList_Append (result, line) == -1) {
+			Py_DECREF (line);
+			goto err;
+		}
 		Py_DECREF (line);
                 length += n;
                 if (hint > 0 && length >= hint)
@@ -440,11 +443,17 @@ O_writelines(Oobject *self, PyObject *args) {
 			Py_DECREF(it);
 			Py_DECREF(s);
 			return NULL;
-		}
-		Py_DECREF(s);
-	}
-	Py_DECREF(it);
-	Py_RETURN_NONE;
+               }
+               Py_DECREF(s);
+       }
+
+       Py_DECREF(it);
+
+       /* See if PyIter_Next failed */
+       if (PyErr_Occurred())
+               return NULL;
+
+       Py_RETURN_NONE;
 }
 
 static struct PyMethodDef O_methods[] = {
-- 
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