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_csv Reader and Writer types shouldn't be directly instantiable #104265

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chgnrdv opened this issue May 7, 2023 · 0 comments · Fixed by #104266
Closed

_csv Reader and Writer types shouldn't be directly instantiable #104265

chgnrdv opened this issue May 7, 2023 · 0 comments · Fixed by #104266
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type-crash A hard crash of the interpreter, possibly with a core dump

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@chgnrdv
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chgnrdv commented May 7, 2023 •
edited by bedevere-bot
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The accepted way to create these objects is to use constructor functions _csv.reader() and _csv.writer() with appropriate arguments. Objects that are created through type constructors _csv.Reader and _csv.Writer turn out to be not properly initialized, and operations on them easily lead to crash:

>>> import _csv
>>> _csv.Writer().writerow([])
Segmentation fault (core dumped)
>>> import _csv
>>> list(_csv.Reader())
Segmentation fault (core dumped)

Although this is an internal detail, I'm sure that this should be fixed. I'll submit a PR shortly.
The crash appears on 3.10, 3.11 and current main.

Linked PRs
@chgnrdv chgnrdv added the type-crash A hard crash of the interpreter, possibly with a core dump label May 7, 2023
@chgnrdv chgnrdv mentioned this issue May 7, 2023
Merged
erlend-aasland pushed a commit that referenced this issue May 7, 2023
@chgnrdv
gh-104265 Disallow instantiation of _csv.Reader and _csv.Writer (#…
06c2a48 
…104266)
@bedevere-bot bedevere-bot mentioned this issue May 7, 2023
Merged
miss-islington pushed a commit to miss-islington/cpython that referenced this issue May 7, 2023
@chgnrdv @miss-islington
pythongh-104265 Disallow instantiation of _csv.Reader and `_csv.Wri…
0a7ec7e 
…ter` (pythonGH-104266)

(cherry picked from commit 06c2a48)

Co-authored-by: chgnrdv <[email protected]>
kumaraditya303 pushed a commit that referenced this issue May 8, 2023
@miss-islington @chgnrdv
[3.11] gh-104265 Disallow instantiation of _csv.Reader and `_csv.Wr…
065e2ae 
…iter` (GH-104266) (#104278)

gh-104265 Disallow instantiation of `_csv.Reader` and `_csv.Writer` (GH-104266)
(cherry picked from commit 06c2a48)

Co-authored-by: chgnrdv <[email protected]>
jbower-fb pushed a commit to jbower-fb/cpython-jbowerfb that referenced this issue May 8, 2023
@chgnrdv @jbower-fb
pythongh-104265 Disallow instantiation of _csv.Reader and `_csv.Wri…
8e76e2d 
…ter` (python#104266)
carljm added a commit to carljm/cpython that referenced this issue May 9, 2023
@carljm
Merge branch 'main' into inlinecomp2
76077cd 
* main: (47 commits)
  pythongh-97696 Remove unnecessary check for eager_start kwarg (python#104188)
  pythonGH-104308: socket.getnameinfo should release the GIL (python#104307)
  pythongh-104310: Add importlib.util.allowing_all_extensions() (pythongh-104311)
  pythongh-99113: A Per-Interpreter GIL! (pythongh-104210)
  pythonGH-104284: Fix documentation gettext build (python#104296)
  pythongh-89550: Buffer GzipFile.write to reduce execution time by ~15% (python#101251)
  pythongh-104223: Fix issues with inheriting from buffer classes (python#104227)
  pythongh-99108: fix typo in Modules/Setup (python#104293)
  pythonGH-104145: Use fully-qualified cross reference types for the bisect module (python#104172)
  pythongh-103193: Improve `getattr_static` test coverage (python#104286)
  Trim trailing whitespace and test on CI (python#104275)
  pythongh-102500: Remove mention of bytes shorthand (python#104281)
  pythongh-97696: Improve and fix documentation for asyncio eager tasks (python#104256)
  pythongh-99108: Replace SHA3 implementation HACL* version (python#103597)
  pythongh-104273: Remove redundant len() calls in argparse function (python#104274)
  pythongh-64660: Don't hardcode Argument Clinic return converter result variable name (python#104200)
  pythongh-104265 Disallow instantiation of `_csv.Reader` and `_csv.Writer` (python#104266)
  pythonGH-102613: Improve performance of `pathlib.Path.rglob()` (pythonGH-104244)
  pythongh-103650: Fix perf maps address format (python#103651)
  pythonGH-89812: Churn `pathlib.Path` methods (pythonGH-104243)
  ...
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gh-104265 Disallow instantiation of _csv.Reader and _csv.Writer chgnrdv/cpython
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