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GeezerVison is showing github.com — [3.14] gh-150449: Raise ValueError for sqlite3.Blob slices with a negative step (GH-155773) by serhiy-storchaka · Pull Request #159110 · python/cpython

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@serhiy-storchaka

@serhiy-storchaka serhiy-storchaka commented Oct 10, 2026

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Reading or writing such a slice computed a negative length and failed with SystemError. Empty slices, which select nothing, are still allowed.

(cherry picked from commit 503560d)

Backported from 3.15 (GH-155773), not from the main branch: the change on the main branch is GH-150450, which adds support for negative steps.

Modules/_sqlite/blob.c and the NEWS entry applied cleanly. The only conflict was in Lib/test/test_sqlite3/test_dbapi.py, because test_blob_set_slice_with_step_keeps_bytes_intact(), which follows the new test on 3.15, does not exist on 3.14. The new test is added in the same place, right after test_blob_set_slice().

  • Issue: sqlite3: Blob crashes when using a negative-step slice #150449

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@serhiy-storchaka
[3.14] pythongh-150449: Raise ValueError for sqlite3.Blob slices with…
aad92bd 
… a negative step (pythonGH-155773)

Reading or writing such a slice computed a negative length and failed with
SystemError.  Empty slices, which select nothing, are still allowed.
(cherry picked from commit 503560d)

Co-authored-by: Serhiy Storchaka <[email protected]>
(cherry picked from commit d9e8d226a3d05ea020256086aee24d21f9792206)
@serhiy-storchaka
serhiy-storchaka requested a review from erlend-aasland as a code owner October 10, 2026 11:14
@bedevere-app bedevere-app Bot added the type-feature A feature request or enhancement label Oct 10, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Oct 10, 2026
sqlite3: Blob crashes when using a negative-step slice #150449
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@bedevere-app bedevere-app Bot added the awaiting core review label Oct 10, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Oct 10, 2026
[3.15] gh-150449: Raise ValueError for sqlite3.Blob slices with a negative step #155773
Merged
@serhiy-storchaka serhiy-storchaka removed the type-feature A feature request or enhancement label Oct 10, 2026
@serhiy-storchaka
serhiy-storchaka enabled auto-merge (squash) October 10, 2026 11:17
@serhiy-storchaka
serhiy-storchaka merged commit 15045f4 into python:3.14 Oct 10, 2026
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@bedevere-app bedevere-app Bot removed the awaiting core review label Oct 10, 2026
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@erlend-aasland erlend-aasland Awaiting requested review from erlend-aasland erlend-aasland is a code owner

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@serhiy-storchaka
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