os.chdir() may leak memory on Windows

[izbyshev]

BPO	32903
Nosy	@pfmoore, @vstinner, @tjguk, @zware, @zooba, @zhangyangyu, @izbyshev
PRs	bpo-32903: Fix a memory leak in os.chdir() on Windows #5801 [3.7] bpo-32903: Fix a memory leak in os.chdir() on Windows (GH-5801) #5945 [3.6] bpo-32903: Fix a memory leak in os.chdir() on Windows (GH-5801) #5946 [2.7] bpo-32903: Fix a memory leak in os.chdir() on Windows (GH-5801). #5947

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-03-01.10:29:40.064>
created_at = <Date 2018-02-22.00:37:42.528>
labels = ['extension-modules', '3.7', '3.8', 'OS-windows', 'performance']
title = 'os.chdir() may leak memory on Windows'
updated_at = <Date 2018-03-01.10:29:40.063>
user = 'https://github.com/izbyshev'

bugs.python.org fields:

activity = <Date 2018-03-01.10:29:40.063>
actor = 'xiang.zhang'
assignee = 'none'
closed = True
closed_date = <Date 2018-03-01.10:29:40.064>
closer = 'xiang.zhang'
components = ['Extension Modules', 'Windows']
creation = <Date 2018-02-22.00:37:42.528>
creator = 'izbyshev'
dependencies = []
files = []
hgrepos = []
issue_num = 32903
keywords = ['patch']
message_count = 4.0
messages = ['312522', '313086', '313090', '313091']
nosy_count = 7.0
nosy_names = ['paul.moore', 'vstinner', 'tim.golden', 'zach.ware', 'steve.dower', 'xiang.zhang', 'izbyshev']
pr_nums = ['5801', '5945', '5946', '5947']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue32903'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[izbyshev]

'new_path' is not freed if the new directory is a UNC path longer than MAX_PATH.

[zhangyangyu]

New changeset 3e197c7 by Xiang Zhang (Alexey Izbyshev) in branch 'master':
bpo-32903: Fix a memory leak in os.chdir() on Windows (GH-5801)
3e197c7

[zhangyangyu]

New changeset aa40f92 by Xiang Zhang (Alexey Izbyshev) in branch '2.7':
[2.7] bpo-32903: Fix a memory leak in os.chdir() on Windows (GH-5801). (bpo-5947)
aa40f92

[zhangyangyu]

New changeset 6ae75d9 by Xiang Zhang (Miss Islington (bot)) in branch '3.7':
bpo-32903: Fix a memory leak in os.chdir() on Windows (GH-5801) (bpo-5945)
6ae75d9