Issue #9448: Fix a leak of OS resources (mutexes or semaphores) when
re-initializing a buffered IO object by calling its `__init__` method.
diff --git a/Misc/NEWS b/Misc/NEWS
index 94bf2b9..7d1317d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -29,6 +29,9 @@
Library
-------
+- Issue #9448: Fix a leak of OS resources (mutexes or semaphores) when
+ re-initializing a buffered IO object by calling its ``__init__`` method.
+
- Issue #1713: Fix os.path.ismount(), which returned true for symbolic links
across devices.
diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index 07fe0a1..1dd1ec4 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -636,6 +636,8 @@
return -1;
}
#ifdef WITH_THREAD
+ if (self->lock)
+ PyThread_free_lock(self->lock);
self->lock = PyThread_allocate_lock();
if (self->lock == NULL) {
PyErr_SetString(PyExc_RuntimeError, "can't allocate read lock");