gh-151524: Avoid using instrumentation callback result after Py_DECREF

lpyu001 · lpyu001 · commit a4cc0af4fbb7 · 2026-06-16T10:46:26.000+08:00
diff --git a/Python/instrumentation.c b/Python/instrumentation.c
@@ -989,8 +989,9 @@ call_one_instrument(
     if (res == NULL) {
         return -1;
     }
+    int is_disable = (res == &_PyInstrumentation_DISABLE);
     Py_DECREF(res);
-    return (res == &_PyInstrumentation_DISABLE);
+    return is_disable;
 }
 
 static const int8_t MOST_SIGNIFICANT_BITS[16] = {

Original file line number	Diff line number	Diff line change
`@@ -989,8 +989,9 @@ call_one_instrument(`
`989`	`989`	`if (res == NULL) {`
`990`	`990`	`return -1;`
`991`	`991`	`}`
	`992`	`+ int is_disable = (res == &_PyInstrumentation_DISABLE);`
`992`	`993`	`Py_DECREF(res);`
`993`		`- return (res == &_PyInstrumentation_DISABLE);`
	`994`	`+ return is_disable;`
`994`	`995`	`}`
`995`	`996`
`996`	`997`	`static const int8_t MOST_SIGNIFICANT_BITS[16] = {`