[3.13] gh-145105: Fix crash in csv.reader with re-entrant iterator (GH-145106)#148405
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gpshead merged 1 commit intopython:3.13from Apr 11, 2026
Merged
[3.13] gh-145105: Fix crash in csv.reader with re-entrant iterator (GH-145106)#148405gpshead merged 1 commit intopython:3.13from
gpshead merged 1 commit intopython:3.13from
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…thonGH-145106) 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>
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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
_csv.reader: NULL deref via re-entrant iterator #145105