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[3.14] gh-140576: Fixed crash produced by lexer in case of dedented zero byte (GH-140583) (#140757)

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gh-140576: Fixed crash produced by lexer in case of dedented zero byte (GH-140583)
(cherry picked from commit 8706167474)

Co-authored-by: Mikhail Efimov <efimov.mikhail@gmail.com>
This commit is contained in:
Miss Islington (bot) 2025-10-29 14:54:37 +01:00 • committed by GitHub
parent e0f54a0bda
commit c45ab05a3a
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3 changed files with 6 additions and 0 deletions
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1
Lib/test/test_tokenize.py
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@ -3183,6 +3183,7 @@ def get_tokens(string):
f'__{
x:d
}__'""",
" a\n\x00",
]:
with self.subTest(case=case):
self.assertRaises(tokenize.TokenError, get_tokens, case)

2
Misc/NEWS.d/next/Core_and_Builtins/2025-10-25-17-36-46.gh-issue-140576.kj0SCY.rst Normal file
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@ -0,0 +1,2 @@
Fixed crash in :func:`tokenize.generate_tokens` in case of
specific incorrect input. Patch by Mikhail Efimov.

3
Parser/lexer/lexer.c
View file

@ -539,6 +539,9 @@ tok_get_normal_mode(struct tok_state *tok, tokenizer_mode* current_tok, struct t
return MAKE_TOKEN(ERRORTOKEN);
}
}
else if (c == EOF && PyErr_Occurred()) {
return MAKE_TOKEN(ERRORTOKEN);
}
else {
break;
}