[issue43847] [Windows] ntpath.realpath() of bytes root directory may raise TypeError in some cases

[Steve Dower]

Change by Steve Dower :


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keywords: +easy

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[issue43847] [Windows] ntpath.realpath() of bytes root directory may raise TypeError in some cases

[Eryk Sun]

Eryk Sun  added the comment:

In ntpath._getfinalpathname_nonstrict(), `tail` should be initialized to 
`path[:0]`. 

Currently `tail` is initialized to the empty string value ''. If an error 
occurs that's allowed and `path` is a root directory that's passed as bytes, 
then joining `path + tail` will fail if `tail` still has its initial value. 

To reproduce this issue, create a substitute drive for a directory that grants 
no access. For example:

import os
os.mkdir('spam')
os.system('icacls spam /inheritance:r')
os.system('subst N: spam')

>>> os.path.realpath(b'N:/')
Traceback (most recent call last):
  File "C:\Program Files\Python39\lib\ntpath.py", line 647, in realpath
path = _getfinalpathname(path)
PermissionError: [WinError 5] Access is denied: b'N:\\'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files\Python39\lib\ntpath.py", line 601, in 
_getfinalpathname_nonstrict
path = _getfinalpathname(path)
PermissionError: [WinError 5] Access is denied: b'N:\\'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "", line 1, in 
  File "C:\Program Files\Python39\lib\ntpath.py", line 651, in realpath
path = _getfinalpathname_nonstrict(path)
  File "C:\Program Files\Python39\lib\ntpath.py", line 621, in 
_getfinalpathname_nonstrict
return path + tail
TypeError: can't concat str to bytes

--
components: +Library (Lib)
nosy: +Antoine d'Otreppe, eryksun -9001
stage:  -> needs patch
title: realpath of bytestr smb drive letters fail -> [Windows] 
ntpath.realpath() of bytes root directory may raise TypeError in some cases
versions: +Python 3.10

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