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Title: [3.13] gh-145105: Fix crash in csv.reader with re-entrant iterator (GH-145106) by miss-islington · Pull Request #148405 · python/cpython · GitHub

Open Graph Title: [3.13] gh-145105: Fix crash in csv.reader with re-entrant iterator (GH-145106) by miss-islington · Pull Request #148405 · python/cpython

X Title: [3.13] gh-145105: Fix crash in csv.reader with re-entrant iterator (GH-145106) by miss-islington · Pull Request #148405 · python/cpython

Description: When a custom iterator calls next() on the same csv.reader from within next, the inner iteration sets self->fields to NULL. The outer iteration then crashes in parse_save_field() by passing NULL to PyList_Append. Add a guard after PyIter_Next() to detect that fields was set to NULL by a re-entrant call, and raise csv.Error instead of crashing. (cherry picked from commit 20994b1) Co-authored-by: Ramin Farajpour Cami ramin.blackhat@gmail.com Issue: gh-145105

Open Graph Description: When a custom iterator calls next() on the same csv.reader from within next, the inner iteration sets self->fields to NULL. The outer iteration then crashes in parse_save_field() by passing NULL...

X Description: When a custom iterator calls next() on the same csv.reader from within next, the inner iteration sets self->fields to NULL. The outer iteration then crashes in parse_save_field() by passing ...

Opengraph URL: https://github.com/python/cpython/pull/148405

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8a15ef6 gh-145105: Fix crash in csv.reader with re-entrant iterator (GH-145106) raminfp Apr 11, 2026 https://github.com/python/cpython/pull/148405/commits/8a15ef691698e07005df5fbcb1947630fe2f90fc
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