Fix SF security vulnerability: 32660278
am: 2d8a2432e0

Change-Id: Ia5f419d7d113692f5d52b483f70ca09589333e13
diff --git a/libs/gui/BufferQueueConsumer.cpp b/libs/gui/BufferQueueConsumer.cpp
index d62eaf7..bc6f3f0 100644
--- a/libs/gui/BufferQueueConsumer.cpp
+++ b/libs/gui/BufferQueueConsumer.cpp
@@ -517,6 +517,7 @@
 }
 
 sp<NativeHandle> BufferQueueConsumer::getSidebandStream() const {
+    Mutex::Autolock lock(mCore->mMutex);
     return mCore->mSidebandStream;
 }