1 files changed, 6 insertions, 2 deletions
diff --git a/Modules/_bz2module.c b/Modules/_bz2module.c
index 0789b61..3890b60 100644
--- a/Modules/_bz2module.c
+++ b/Modules/_bz2module.c
@@ -634,11 +634,15 @@ _bz2_BZ2Decompressor___init___impl(BZ2Decompressor *self)
 {
     int bzerror;
 
-    self->lock = PyThread_allocate_lock();
-    if (self->lock == NULL) {
+    PyThread_type_lock lock = PyThread_allocate_lock();
+    if (lock == NULL) {
         PyErr_SetString(PyExc_MemoryError, "Unable to allocate lock");
         return -1;
     }
+    if (self->lock != NULL) {
+        PyThread_free_lock(self->lock);
+    }
+    self->lock = lock;
 
     self->needs_input = 1;
     self->bzs_avail_in_real = 0;