From 09b7e2a095a6614e88d63928b105af9bb34e8c07 Mon Sep 17 00:00:00 2001
From: Finn Voorhees <finnvoorhees@gmail.com>
Date: Wed, 21 May 2025 17:06:03 +0100
Subject: [PATCH] Fix heap-use-after-free in AudioMixerByMultiTrack

---
 .../Sources/Mixer/AudioMixerByMultiTrack.swift    | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/HaishinKit/Sources/Mixer/AudioMixerByMultiTrack.swift b/HaishinKit/Sources/Mixer/AudioMixerByMultiTrack.swift
index 103658186..3d97de3e1 100644
--- a/HaishinKit/Sources/Mixer/AudioMixerByMultiTrack.swift
+++ b/HaishinKit/Sources/Mixer/AudioMixerByMultiTrack.swift
@@ -67,6 +67,15 @@ final class AudioMixerByMultiTrack: AudioMixer {
         return status
     }
 
+    deinit {
+        if let mixerNode = mixerNode {
+            AudioOutputUnitStop(mixerNode.audioUnit)
+        }
+        if let outputNode = outputNode {
+            AudioOutputUnitStop(outputNode.audioUnit)
+        }
+    }
+
     func append(_ track: UInt8, buffer: CMSampleBuffer) {
         if settings.mainTrack == track {
             inSourceFormat = buffer.formatDescription
@@ -91,6 +100,12 @@ final class AudioMixerByMultiTrack: AudioMixer {
     }
 
     private func setupAudioNodes() throws {
+        if let mixerNode {
+            AudioOutputUnitStop(mixerNode.audioUnit)
+        }
+        if let outputNode {
+            AudioOutputUnitStop(outputNode.audioUnit)
+        }
         mixerNode = nil
         outputNode = nil
         guard let outputFormat else {