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Title: gh-150449: Fix sqlite3.Blob crash with negative-step slices by ever0de · Pull Request #150450 · python/cpython · GitHub

Open Graph Title: gh-150449: Fix sqlite3.Blob crash with negative-step slices by ever0de · Pull Request #150450 · python/cpython

X Title: gh-150449: Fix sqlite3.Blob crash with negative-step slices by ever0de · Pull Request #150450 · python/cpython

Description: Reading or writing a sqlite3.Blob with a negative-step slice such as blob[9:0:-2] caused a crash (SystemError on older versions, ValueError on current main) because the C code computed stop - start as the read length, which is negative for negative steps. Fix subscript_slice() and ass_subscript_slice() in Modules/_sqlite/blob.c to handle both positive and negative steps correctly: For step > 1: keep reading [start, stop) and indexing forward as before. For step < -1: read the contiguous range [start+(len-1)*step, start] and index backward with stride -step. Issue: gh-150449

Open Graph Description: Reading or writing a sqlite3.Blob with a negative-step slice such as blob[9:0:-2] caused a crash (SystemError on older versions, ValueError on current main) because the C code computed stop - start...

X Description: Reading or writing a sqlite3.Blob with a negative-step slice such as blob[9:0:-2] caused a crash (SystemError on older versions, ValueError on current main) because the C code computed stop - start...

Opengraph URL: https://github.com/python/cpython/pull/150450

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af0eb65 gh-150449: Fix sqlite3.Blob crash with negative-step slices ever0de May 26, 2026 https://github.com/python/cpython/pull/150450/commits/af0eb656e77f13b542e8956f1dec987857ff082e
85312b4 gh-150449: validate slice assignment size even for empty slices ever0de May 26, 2026 https://github.com/python/cpython/pull/150450/commits/85312b4ed5ece748468f79875bd1dc926f6c62e1
c0c2018 gh-150449: add tests for negative-step slices with start <= stop ever0de May 26, 2026 https://github.com/python/cpython/pull/150450/commits/c0c20185e8cff47684ce18597e50b9c759896a28
83d3a3c Fix PEP 7 line-length violations in blob.c (ass_subscript_slice) ever0de May 26, 2026 https://github.com/python/cpython/pull/150450/commits/83d3a3c295cd60a8847c45687d1bd2612ca12eed
f7c9f53 gh-150449: Address review: docs, tests, and rename write_offset ever0de May 30, 2026 https://github.com/python/cpython/pull/150450/commits/f7c9f53f26e9d96b974c353114696ddfc5a34606
5087b42 gh-150449: Fix versionchanged version: use 'next' not '3.16' ever0de May 30, 2026 https://github.com/python/cpython/pull/150450/commits/5087b422665452ca1c70ae2aaf66766d8d1aaaed
d774ab7 gh-150449: Fix wording in NEWS and whatsnew: 'crash' → 'raise SystemE… ever0de May 30, 2026 https://github.com/python/cpython/pull/150450/commits/d774ab7d66e6a1ccfb846346c1c3859ca2949301
5bf02de gh-150449: Remove redundant issue references from test comments ever0de May 30, 2026 https://github.com/python/cpython/pull/150450/commits/5bf02de6365b15fc222773228b62d63d342029d1
c311c8e Merge remote-tracking branch 'upstream/main' into gh-150449-fix-sqlit… ever0de May 30, 2026 https://github.com/python/cpython/pull/150450/commits/c311c8e483161c53304346e38e207307d04ff0b3
d4b4b43 gh-150449: Fix missing blank line after xml section in whatsnew ever0de May 30, 2026 https://github.com/python/cpython/pull/150450/commits/d4b4b43fb625a57437c8315aff0071acac6ab033
0936d6b gh-150449: Rename read_length to write_length in ass_subscript_slice ever0de May 30, 2026 https://github.com/python/cpython/pull/150450/commits/0936d6b02038a0712412d743d7a40fc4c83ecdb4
5f2f916 gh-150449: Move empty-slice validation fix to dedicated PR for gh-150913 ever0de Jun 4, 2026 https://github.com/python/cpython/pull/150450/commits/5f2f91625c3da69dbd67bd8733b61f2800daa5e1
d47abf8 Merge remote-tracking branch 'upstream/main' into gh-150449-fix-sqlit… ever0de Jun 4, 2026 https://github.com/python/cpython/pull/150450/commits/d47abf89f56d74e8815a181fcc21f075acc4a31e
be1aa18 gh-150449: Add tests for extreme step values in sqlite3.Blob slice op… ever0de Jun 5, 2026 https://github.com/python/cpython/pull/150450/commits/be1aa18c77e38d820e9d69bea4cb257677e3e976
f76ebf7 gh-150449: Assert correctness of extreme-step slice assignment in sql… ever0de Jun 5, 2026 https://github.com/python/cpython/pull/150450/commits/f76ebf77d037d7d906c7161bda05d88f774ae501
52084f9 gh-150449: Isolate extreme-step Blob assignment tests ever0de Jun 5, 2026 https://github.com/python/cpython/pull/150450/commits/52084f9e07249bf99e907dc971c9c4503f5b6ef8
a462e70 Merge branch 'main' into gh-150449-fix-sqlite-blob-negative-step-slice serhiy-storchaka Jun 8, 2026 https://github.com/python/cpython/pull/150450/commits/a462e70375053af9f86192a31928cf23a19e4b69
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