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[3.15] gh-160324: Keep io.StringIO state after MemoryError (GH-160325) - #161041

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@miss-islington

@miss-islington miss-islington commented Oct 31, 2026 •

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Allocate before consuming the accumulated writes in realize() and
make_intermediate(), and reset the size when the contents are lost,
so that later calls do not index outside the internal buffer.

Shrink the buffer of the accumulating writer before finishing it, so
that getvalue(), read() and the other methods leave the contents
unchanged when they fail with MemoryError instead of dropping them.

ANT-2026-MPHGX2FL
(cherry picked from commit 83b047e)

Co-authored-by: Gregory P. Smith 68491+gpshead@users.noreply.github.com

…GH-160325)

Allocate before consuming the accumulated writes in realize() and
make_intermediate(), and reset the size when the contents are lost,
so that later calls do not index outside the internal buffer.

Shrink the buffer of the accumulating writer before finishing it, so
that getvalue(), read() and the other methods leave the contents
unchanged when they fail with MemoryError instead of dropping them.

ANT-2026-MPHGX2FL
(cherry picked from commit 83b047ef80836c24672cf3e2e807e68efed7d495)

Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
@hugovk

hugovk commented Nov 1, 2026

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./Modules/_io/stringio.c:150:5: error: implicit declaration of function ‘_PyUnicodeWriter_SetBuffer’; did you mean ‘_PyUnicodeWriter_InitWithBuffer’? [-Wimplicit-function-declaration]

@gpshead _PyUnicodeWriter_SetBuffer was added in #158452 and hasn't been backported.

Same thing for the 3.14 backport: #161042.

@gpshead gpshead self-assigned this Nov 1, 2026
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