gh-129271: Fix reference leak with unicode writer in fast path in the json module (#129272)

pablogsal · web-flow · commit 7a54a653b718 · 2025-01-25T17:54:20.000+01:00
diff --git a/Modules/_json.c b/Modules/_json.c
@@ -417,6 +417,7 @@ scanstring_unicode(PyObject *pystr, Py_ssize_t end, int strict, Py_ssize_t *next
                 if (ret == NULL) {
                     goto bail;
                 }
+                PyUnicodeWriter_Discard(writer);
                 *next_end_ptr = next + 1;;
                 return ret;
             }

Original file line number	Diff line number	Diff line change
`@@ -417,6 +417,7 @@ scanstring_unicode(PyObject pystr, Py_ssize_t end, int strict, Py_ssize_t next`
`417`	`417`	`if (ret == NULL) {`
`418`	`418`	`goto bail;`
`419`	`419`	`}`
	`420`	`+ PyUnicodeWriter_Discard(writer);`
`420`	`421`	`*next_end_ptr = next + 1;;`
`421`	`422`	`return ret;`
`422`	`423`	`}`