d3d11memory: Fix potential crash in GstD3D11PoolAllocator

Allocator object can be the final refcount holder, when a GstD3D11Memory
is being released. Do unref allocator once there's no more
remaining operation.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3715>

diff --git a/subprojects/gst-plugins-bad/gst-libs/gst/d3d11/gstd3d11memory.cpp b/subprojects/gst-plugins-bad/gst-libs/gst/d3d11/gstd3d11memory.cpp
index 37f43f0..ccefdc3 100644 (file)
--- a/subprojects/gst-plugins-bad/gst-libs/gst/d3d11/gstd3d11memory.cpp
+++ b/subprojects/gst-plugins-bad/gst-libs/gst/d3d11/gstd3d11memory.cpp
@@ -2048,12 +2048,13 @@ gst_d3d11_pool_allocator_release_memory (GstD3D11PoolAllocator * self,
 
   GST_MINI_OBJECT_CAST (mem)->dispose = NULL;
   mem->allocator = (GstAllocator *) gst_object_ref (_d3d11_memory_allocator);
-  gst_object_unref (self);
 
   /* keep it around in our queue */
   gst_atomic_queue_push (self->priv->queue, mem);
   gst_poll_write_control (self->priv->poll);
   dec_outstanding (self);
+
+  gst_object_unref (self);
 }
 
 static gboolean