Cutlery/calibre
1
0
Fork 0
mirror of https://github.com/kovidgoyal/calibre.git synced 2025-07-09 03:04:10 -04:00
Code Issues Packages Projects Releases Wiki Activity

Avoid stack overflow due to unbounded recursion in safe_walk

Browse Source
This commit is contained in:
Kovid Goyal 2020-01-04 09:03:50 +05:30
parent e6657d999a
commit 513f9a3a30
No known key found for this signature in database
GPG Key ID: 06BC317B515ACE7C
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/calibre/devices/usbms/driver.py
View File

@ -34,8 +34,10 @@ def debug_print(*args):
prints('DEBUG: %6.1f'%(time.time()-BASE_TIME), *args)
def safe_walk(top, topdown=True, onerror=None, followlinks=False):
def safe_walk(top, topdown=True, onerror=None, followlinks=False, maxdepth=128):
' A replacement for os.walk that does not die when it encounters undecodeable filenames in a linux filesystem'
if maxdepth < 0:
return
islink, join, isdir = os.path.islink, os.path.join, os.path.isdir
# We may not have read permission for top, in which case we can't
@ -45,7 +47,7 @@ def safe_walk(top, topdown=True, onerror=None, followlinks=False):
# left to visit. That logic is copied here.
try:
names = os.listdir(top)
except os.error as err:
except OSError as err:
if onerror is not None:
onerror(err)
return
@ -68,7 +70,7 @@ def safe_walk(top, topdown=True, onerror=None, followlinks=False):
for name in dirs:
new_path = join(top, name)
if followlinks or not islink(new_path):
for x in safe_walk(new_path, topdown, onerror, followlinks):
for x in safe_walk(new_path, topdown, onerror, followlinks, maxdepth-1):
yield x
if not topdown:
yield top, dirs, nondirs