From bd3dcb3549e9c1c26495bc3cc1a45197079bdcaf Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Thu, 6 Oct 2022 12:09:50 -0700
Subject: [3.11] GH-88050: fix race in closing subprocess pipe in asyncio 
 (GH-97951) (#97978)

Check for None when iterating over `self._pipes.values()`.
(cherry picked from commit e2e6b95c0342247ed1a761b6e149ac579a8722dd)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
---
 Lib/asyncio/base_subprocess.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Lib/asyncio/base_subprocess.py b/Lib/asyncio/base_subprocess.py
index c2ca4a2..e15bb41 100644
--- a/Lib/asyncio/base_subprocess.py
+++ b/Lib/asyncio/base_subprocess.py
@@ -216,7 +216,9 @@ class BaseSubprocessTransport(transports.SubprocessTransport):
             self._proc.returncode = returncode
         self._call(self._protocol.process_exited)
         for p in self._pipes.values():
-            p.pipe.close()
+            if p is not None:
+                p.pipe.close()
+
         self._try_finish()
 
     async def _wait(self):
-- 
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