https://github.com/python/cpython/commit/5b0ab21364813b4f78e04a1a6b2805f6bdcc5d46
commit: 5b0ab21364813b4f78e04a1a6b2805f6bdcc5d46
branch: main
author: Jelle Zijlstra <[email protected]>
committer: JelleZijlstra <[email protected]>
date: 2026-10-19T19:29:25-07:00
summary:
gh-159739: Check character formatting allocation failure (#159746)
Propagate the error from PyUnicode_FromOrdinal() before using the
result.
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.173d49.rst
M Objects/unicode_formatter.c
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.173d49.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.173d49.rst
new file mode 100644
index 00000000000000..a552d06ff7bb89
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.173d49.rst
@@ -0,0 +1,2 @@
+Avoid a crash if formatting an integer with the ``c`` presentation type runs
+out of memory.
diff --git a/Objects/unicode_formatter.c b/Objects/unicode_formatter.c
index 8cbc774584fa68..7f0e0584f3813f 100644
--- a/Objects/unicode_formatter.c
+++ b/Objects/unicode_formatter.c
@@ -1258,6 +1258,9 @@ format_long_internal(PyObject *value, const
InternalFormatSpec *format,
goto done;
}
tmp = PyUnicode_FromOrdinal(x);
+ if (tmp == NULL) {
+ goto done;
+ }
inumeric_chars = 0;
n_digits = 1;
maxchar = Py_MAX(maxchar, (Py_UCS4)x);
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