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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
+22 −2
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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Update Parser/tokenizer/helpers.c 
Co-authored-by: AN Long <[email protected]>
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@AdamKorcz @aisk
AdamKorcz and aisk authored Feb 16, 2026
commit 9edd6f8868e836460ab76e2417e2418286ee1b48
6 changes: 4 additions & 2 deletions Parser/tokenizer/helpers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -494,9 +494,11 @@ valid_utf8(const unsigned char* s)
return 0;
}
length = expected + 1;
for (int i = 1; i <= expected; i++)
if (s[i] < 0x80 || s[i] >= 0xC0)
for (int i = 1; i <= expected; i++) {
if (s[i] < 0x80 || s[i] >= 0xC0) {
return 0;
}
}
return length;
}

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