From 0e65c5ab4e4c92cd14a43b9b65048b8b57d36ec9 Mon Sep 17 00:00:00 2001
From: Randall Leeds <randall@bleeds.info>
Date: Sun, 13 Mar 2016 14:41:08 -0700
Subject: [PATCH] fix infinite recursion when destroying sockets

By having a `getattr` implementation that proxies to the `sock`
attribute, there is a risk of infinite recursion when the socket
attribute is absent. After closing the socket and destroying it,
the recursion can be prevented by setting the attribute to `None`.
---
 gunicorn/sock.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gunicorn/sock.py b/gunicorn/sock.py
index 4de9728541..c367d1084c 100644
--- a/gunicorn/sock.py
+++ b/gunicorn/sock.py
@@ -53,11 +53,15 @@ def bind(self, sock):
         sock.bind(self.cfg_addr)
 
     def close(self):
+        if self.sock is None:
+            return
+
         try:
             self.sock.close()
         except socket.error as e:
             self.log.info("Error while closing socket %s", str(e))
-        del self.sock
+
+        self.sock = None
 
 
 class TCPSocket(BaseSocket):