https://github.com/python/cpython/commit/8706167474e9a625e5f6613d3c7ac77a62faff58
commit: 8706167474e9a625e5f6613d3c7ac77a62faff58
branch: main
author: Mikhail Efimov <[email protected]>
committer: pablogsal <[email protected]>
date: 2025-10-29T13:27:35Z
summary:
gh-140576: Fixed crash produced by lexer in case of dedented zero byte (#140583)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2025-10-25-17-36-46.gh-issue-140576.kj0SCY.rst
M Lib/test/test_tokenize.py
M Parser/lexer/lexer.c
diff --git a/Lib/test/test_tokenize.py b/Lib/test/test_tokenize.py
index d274726eed2e65..ca67e381958757 100644
--- a/Lib/test/test_tokenize.py
+++ b/Lib/test/test_tokenize.py
@@ -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)
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2025-10-25-17-36-46.gh-issue-140576.kj0SCY.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2025-10-25-17-36-46.gh-issue-140576.kj0SCY.rst
new file mode 100644
index 00000000000000..2c27525d9f782c
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2025-10-25-17-36-46.gh-issue-140576.kj0SCY.rst
@@ -0,0 +1,2 @@
+Fixed crash in :func:`tokenize.generate_tokens` in case of
+specific incorrect input. Patch by Mikhail Efimov.
diff --git a/Parser/lexer/lexer.c b/Parser/lexer/lexer.c
index a69994e9b3d005..7f25afec302c22 100644
--- a/Parser/lexer/lexer.c
+++ b/Parser/lexer/lexer.c
@@ -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;
}
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