From 0049249d63a067aaffbbf3172a6e8cd8c956b643 Mon Sep 17 00:00:00 2001
From: Antoine Pitrou <solipsis@pitrou.net>
Date: Sat, 4 Sep 2010 20:53:29 +0000
Subject: [PATCH] Issue #8734: Avoid crash in msvcrt.get_osfhandle() when an
 invalid file descriptor is provided.  Patch by Pascal Chambon.

---
 Lib/test/test_fileio.py | 3 +++
 Misc/NEWS               | 3 +++
 PC/msvcrtmodule.c       | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/Lib/test/test_fileio.py b/Lib/test/test_fileio.py
index 63bc1d9781e..4b48d41f6ca 100644
--- a/Lib/test/test_fileio.py
+++ b/Lib/test/test_fileio.py
@@ -309,6 +309,9 @@ def testBytesOpen(self):
     def testInvalidFd(self):
         self.assertRaises(ValueError, _FileIO, -10)
         self.assertRaises(OSError, _FileIO, make_bad_fd())
+        if sys.platform == 'win32':
+            import msvcrt
+            self.assertRaises(IOError, msvcrt.get_osfhandle, make_bad_fd())
 
     def testBadModeArgument(self):
         # verify that we get a sensible error message for bad mode argument
diff --git a/Misc/NEWS b/Misc/NEWS
index f413da2e5a6..5d3656066e2 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -100,6 +100,9 @@ Core and Builtins
 Extensions
 ----------
 
+- Issue #8734: Avoid crash in msvcrt.get_osfhandle() when an invalid file
+  descriptor is provided.  Patch by Pascal Chambon.
+
 - Issue #7736: Release the GIL around calls to opendir() and closedir()
   in the posix module.  Patch by Marcin Bachry.
 
diff --git a/PC/msvcrtmodule.c b/PC/msvcrtmodule.c
index e173fea8b03..166df036f2d 100755
--- a/PC/msvcrtmodule.c
+++ b/PC/msvcrtmodule.c
@@ -143,6 +143,9 @@ msvcrt_get_osfhandle(PyObject *self, PyObject *args)
     if (!PyArg_ParseTuple(args,"i:get_osfhandle", &fd))
         return NULL;
 
+    if (!_PyVerify_fd(fd))
+        return PyErr_SetFromErrno(PyExc_IOError);
+
     handle = _get_osfhandle(fd);
     if (handle == -1)
         return PyErr_SetFromErrno(PyExc_IOError);