Fix SF security vulnerability: 32660278 am: 2d8a2432e0 am: e5c91fe2e2 am: 9d14ab5409
am: 275b2347ef

Change-Id: Iae0109ec3bddd6f71bab1759003a34e75270f6d4
diff --git a/libs/gui/BufferQueueConsumer.cpp b/libs/gui/BufferQueueConsumer.cpp
index 7504ed4..7aea4bb 100644
--- a/libs/gui/BufferQueueConsumer.cpp
+++ b/libs/gui/BufferQueueConsumer.cpp
@@ -572,6 +572,7 @@
 }
 
 sp<NativeHandle> BufferQueueConsumer::getSidebandStream() const {
+    Mutex::Autolock lock(mCore->mMutex);
     return mCore->mSidebandStream;
 }