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[3.15] gh-153539: Fix use-after-free in TextIOWrapper.tell() with a reentrant decoder (GH-153540) - #156193
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serhiy-storchaka merged 1 commit intoOct 9, 2026
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…entrant decoder (pythonGH-153540) TextIOWrapper.tell() used a borrowed next_input from the snapshot across the decoder's getstate/decode/setstate calls, so a decoder that reenters seek() from getstate could free it and leave tell() reading freed memory. Own the reference across those calls, matching the sibling textiowrapper_read_chunk. (cherry picked from commit fa0ec86) Co-authored-by: tonghuaroot (童话) <tonghuaroot@gmail.com>
This was referenced Aug 21, 2026
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Manual backport of #153540 to 3.15: the cherry-pick did not apply cleanly, because the test file differs.