Backport PR #62217 on branch 2.3.x (BUG: fix memory leak in JSON datetime serialization) (#62253)

swt2c · Alvaro-Kothe · web-flow · commit 8be57bc81715 · 2025-09-21T15:37:58.000+02:00
Co-authored-by: Álvaro Kothe &lt;kothe65@gmail.com&gt;
diff --git a/pandas/_libs/src/vendored/ujson/python/objToJSON.c b/pandas/_libs/src/vendored/ujson/python/objToJSON.c
@@ -346,7 +346,8 @@ static char *PyDateTimeToIsoCallback(JSOBJ obj, JSONTypeContext *tc,
   }
 
   NPY_DATETIMEUNIT base = ((PyObjectEncoder *)tc->encoder)->datetimeUnit;
-  return PyDateTimeToIso(obj, base, len);
+  GET_TC(tc)->cStr = PyDateTimeToIso(obj, base, len);
+  return GET_TC(tc)->cStr;
 }
 
 static char *PyTimeToJSON(JSOBJ _obj, JSONTypeContext *tc, size_t *outLen) {

Original file line number	Diff line number	Diff line change
`@@ -346,7 +346,8 @@ static char PyDateTimeToIsoCallback(JSOBJ obj, JSONTypeContext tc,`
`346`	`346`	`}`
`347`	`347`
`348`	`348`	`NPY_DATETIMEUNIT base = ((PyObjectEncoder *)tc->encoder)->datetimeUnit;`
`349`		`- return PyDateTimeToIso(obj, base, len);`
	`349`	`+ GET_TC(tc)->cStr = PyDateTimeToIso(obj, base, len);`
	`350`	`+ return GET_TC(tc)->cStr;`
`350`	`351`	`}`
`351`	`352`
`352`	`353`	`static char PyTimeToJSON(JSOBJ _obj, JSONTypeContext tc, size_t *outLen) {`