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[3.14] gh-143377: fix crashes in _interpreters.capture_exception (GH-143418) (#143652)

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gh-143377: fix crashes in `_interpreters.capture_exception` (GH-143418)
(cherry picked from commit ce6bae92da)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
This commit is contained in:
Miss Islington (bot) 2026-01-10 13:05:42 +01:00 • committed by GitHub
parent 5728089b73
commit ea70d16406
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3 changed files with 63 additions and 5 deletions
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15
Python/crossinterp.c
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@ -1038,7 +1038,7 @@ _PyXIData_ReleaseAndRawFree(_PyXIData_t *xidata)
/* convenience utilities */
/*************************/
static const char *
static char *
_copy_string_obj_raw(PyObject *strobj, Py_ssize_t *p_size)
{
Py_ssize_t size = -1;
@ -1139,11 +1139,16 @@ _format_TracebackException(PyObject *tbexc)
}
Py_ssize_t size = -1;
const char *formatted = _copy_string_obj_raw(formatted_obj, &size);
char *formatted = _copy_string_obj_raw(formatted_obj, &size);
Py_DECREF(formatted_obj);
// We remove trailing the newline added by TracebackException.format().
assert(formatted[size-1] == '\n');
((char *)formatted)[size-1] = '\0';
if (formatted == NULL || size == 0) {
return formatted;
}
assert(formatted[size] == '\0');
// Remove a trailing newline if needed.
if (formatted[size-1] == '\n') {
formatted[size-1] = '\0';
}
return formatted;
}