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GeezerVison is showing github.com — marshal.c: 8 refs leaked on corrupt TYPE_CODE marshal stream · Issue #148418 · python/cpython

marshal.c: 8 refs leaked on corrupt TYPE_CODE marshal stream #148418

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marshal.c: 8 refs leaked on corrupt TYPE_CODE marshal stream#148418
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interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

@Wulian233
Wulian233
opened on Apr 12, 2026
Issue body actions

Bug report

Bug description:

Parent: #146121

https://gist.github.com/devdanzin/60b787bfa22651ba6a18aef3b6e1439d/raw/5b12fb962510aed36b457ae3670424bbb91ecacd/marshal_type_code_leak.md

In r_object TYPE_CODE case (line 1601-1602), when firstlineno == -1 && PyErr_Occurred(), code does break instead of goto code_error. Skips cleanup of 8 owned refs. Reachable via marshal.loads() with crafted input.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

  • gh-148418: Fix a possible reference leak in a corrupted TYPE_CODE marshal stream #148419
  • [3.14] gh-148418: Fix a possible reference leak in a corrupted TYPE_CODE marshal stream (GH-148419) #149363
  • [3.13] gh-148418: Fix a possible reference leak in a corrupted TYPE_CODE marshal stream (GH-148419) #149364

Activity

  1. Wulian233
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on Apr 12, 2026
  2. Wulian233
    added a commit that references this issue on Apr 12, 2026

    pythongh-148418: Fix a possible reference leak in a corrupted ``TYPE_…

    6855d74
  3. aisk
    added a parent issue on Apr 12, 2026
    • Umbrella issue: bugs found using cpython-review-toolkit #146102
  4. aisk
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)
    extension-modulesC modules in the Modules dirC modules in the Modules dir
    and removed
    extension-modulesC modules in the Modules dirC modules in the Modules dir
    on Apr 12, 2026
  5. serhiy-storchaka
    added a commit that references this issue on May 4, 2026

    gh-148418: Fix a possible reference leak in a corrupted TYPE_CODE mar…

    c3972f2
  6. serhiy-storchaka
    closed this as completedon May 4, 2026
  7. serhiy-storchaka
    added 2 commits that reference this issue on May 4, 2026

    [3.13] gh-148418: Fix a possible reference leak in a corrupted TYPE_C…

    6d6471b

    [3.14] gh-148418: Fix a possible reference leak in a corrupted TYPE_C…

    95979d1
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    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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