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gh-144872: fix heap buffer overflow _PyTokenizer_ensure_utf8 #144807

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Merged
pablogsal merged 6 commits into from
Feb 26, 2026
Merged

gh-144872: fix heap buffer overflow _PyTokenizer_ensure_utf8 #144807

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d30f29a
oss-fuzz-451112368: fix found crash
Feb 13, 2026
e9b3683
Add a regression test for oss-fuzz-451112368
gpshead Feb 14, 2026
2aa5f1e
add NEWS entry
AdamKorcz Feb 16, 2026
8eba1c7
Update Misc/NEWS.d/next/Library/2026-02-16-12-28-43.gh-issue-144872.k…
AdamKorcz Feb 16, 2026
9edd6f8
Update Parser/tokenizer/helpers.c
AdamKorcz Feb 16, 2026
56d99c2
gh-144872: move NEWS entry to Core_and_Builtins
pablogsal Feb 26, 2026
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oss-fuzz-451112368: fix found crash 
Signed-off-by: Adam <[email protected]>
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Adam authored and Adam committed Feb 13, 2026
commit d30f29ade144f735a23371b865244cb1fc165949
4 changes: 2 additions & 2 deletions Parser/tokenizer/helpers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -494,8 +494,8 @@ valid_utf8(const unsigned char* s)
return 0;
}
length = expected + 1;
for (; expected; expected--)
if (s[expected] < 0x80 || s[expected] >= 0xC0)
for (int i = 1; i <= expected; i++)
if (s[i] < 0x80 || s[i] >= 0xC0)
return 0;
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return length;
}
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