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Do not assign new fp attribute when exiting context manager #7566

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Merged
hugovk merged 2 commits into from
Dec 31, 2023
Merged

Do not assign new fp attribute when exiting context manager #7566

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5431b15
Do not assign new fp attribute to image when exiting context manager
radarhere Nov 24, 2023
5fb86c5
Moved code closing fp and _fp into common method
radarhere Nov 29, 2023
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5 changes: 5 additions & 0 deletions Tests/test_image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1015,6 +1015,11 @@ def test_fli_overrun2(self):
except OSError as e:
assert str(e) == "buffer overrun when reading image file"

def test_exit_fp(self):
with Image.new("L", (1, 1)) as im:
pass
assert not hasattr(im, "fp")

def test_close_graceful(self, caplog):
with Image.open("Tests/images/hopper.jpg") as im:
copy = im.copy()
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27 changes: 13 additions & 14 deletions src/PIL/Image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -527,15 +527,19 @@ def _new(self, im):
def __enter__(self):
return self

def _close_fp(self):
if getattr(self, "_fp", False):
if self._fp != self.fp:
self._fp.close()
self._fp = DeferredError(ValueError("Operation on closed image"))
if self.fp:
self.fp.close()

def __exit__(self, *args):
if hasattr(self, "fp") and getattr(self, "_exclusive_fp", False):
if getattr(self, "_fp", False):
if self._fp != self.fp:
self._fp.close()
self._fp = DeferredError(ValueError("Operation on closed image"))
if self.fp:
self.fp.close()
self.fp = None
if hasattr(self, "fp"):
if getattr(self, "_exclusive_fp", False):
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@akx akx Nov 29, 2023

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Out of curiosity: does exclusive_fp mean, like I think it does, "we own this fp because we opened it"? If so, does it make sense for .close() to also close FPs that aren't "owned" by this instance?

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@radarhere radarhere Nov 29, 2023

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Out of curiosity: does exclusive_fp mean, like I think it does, "we own this fp because we opened it"?

Yes

Pillow/src/PIL/Image.py

Lines 3250 to 3258 in 697c24b

if filename:
fp = builtins.open(filename, "rb")
exclusive_fp = True
try:
fp.seek(0)
except (AttributeError, io.UnsupportedOperation):
fp = io.BytesIO(fp.read())
exclusive_fp = True

If so, does it make sense for .close() to also close FPs that aren't "owned" by this instance?

See #5309

self._close_fp()
self.fp = None

def close(self):
"""
Expand All @@ -551,12 +555,7 @@ def close(self):
"""
if hasattr(self, "fp"):
try:
if getattr(self, "_fp", False):
if self._fp != self.fp:
self._fp.close()
self._fp = DeferredError(ValueError("Operation on closed image"))
if self.fp:
self.fp.close()
self._close_fp()
self.fp = None
except Exception as msg:
logger.debug("Error closing: %s", msg)
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