diff --git a/libs/gui/BufferQueue.cpp b/libs/gui/BufferQueue.cpp
index a8da134..5fb3f0b 100644
--- a/libs/gui/BufferQueue.cpp
+++ b/libs/gui/BufferQueue.cpp
@@ -38,7 +38,7 @@
 
 void BufferQueue::ProxyConsumerListener::onDisconnect() {
     sp<ConsumerListener> listener(mConsumerListener.promote());
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onDisconnect();
     }
 }
@@ -46,7 +46,7 @@
 void BufferQueue::ProxyConsumerListener::onFrameAvailable(
         const BufferItem& item) {
     sp<ConsumerListener> listener(mConsumerListener.promote());
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onFrameAvailable(item);
     }
 }
@@ -54,21 +54,21 @@
 void BufferQueue::ProxyConsumerListener::onFrameReplaced(
         const BufferItem& item) {
     sp<ConsumerListener> listener(mConsumerListener.promote());
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onFrameReplaced(item);
     }
 }
 
 void BufferQueue::ProxyConsumerListener::onBuffersReleased() {
     sp<ConsumerListener> listener(mConsumerListener.promote());
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onBuffersReleased();
     }
 }
 
 void BufferQueue::ProxyConsumerListener::onSidebandStreamChanged() {
     sp<ConsumerListener> listener(mConsumerListener.promote());
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onSidebandStreamChanged();
     }
 }
@@ -85,21 +85,21 @@
 void BufferQueue::createBufferQueue(sp<IGraphicBufferProducer>* outProducer,
         sp<IGraphicBufferConsumer>* outConsumer,
         bool consumerIsSurfaceFlinger) {
-    LOG_ALWAYS_FATAL_IF(outProducer == NULL,
+    LOG_ALWAYS_FATAL_IF(outProducer == nullptr,
             "BufferQueue: outProducer must not be NULL");
-    LOG_ALWAYS_FATAL_IF(outConsumer == NULL,
+    LOG_ALWAYS_FATAL_IF(outConsumer == nullptr,
             "BufferQueue: outConsumer must not be NULL");
 
     sp<BufferQueueCore> core(new BufferQueueCore());
-    LOG_ALWAYS_FATAL_IF(core == NULL,
+    LOG_ALWAYS_FATAL_IF(core == nullptr,
             "BufferQueue: failed to create BufferQueueCore");
 
     sp<IGraphicBufferProducer> producer(new BufferQueueProducer(core, consumerIsSurfaceFlinger));
-    LOG_ALWAYS_FATAL_IF(producer == NULL,
+    LOG_ALWAYS_FATAL_IF(producer == nullptr,
             "BufferQueue: failed to create BufferQueueProducer");
 
     sp<IGraphicBufferConsumer> consumer(new BufferQueueConsumer(core));
-    LOG_ALWAYS_FATAL_IF(consumer == NULL,
+    LOG_ALWAYS_FATAL_IF(consumer == nullptr,
             "BufferQueue: failed to create BufferQueueConsumer");
 
     *outProducer = producer;
@@ -109,8 +109,8 @@
 #ifndef NO_BUFFERHUB
 void BufferQueue::createBufferHubQueue(sp<IGraphicBufferProducer>* outProducer,
                                        sp<IGraphicBufferConsumer>* outConsumer) {
-    LOG_ALWAYS_FATAL_IF(outProducer == NULL, "BufferQueue: outProducer must not be NULL");
-    LOG_ALWAYS_FATAL_IF(outConsumer == NULL, "BufferQueue: outConsumer must not be NULL");
+    LOG_ALWAYS_FATAL_IF(outProducer == nullptr, "BufferQueue: outProducer must not be NULL");
+    LOG_ALWAYS_FATAL_IF(outConsumer == nullptr, "BufferQueue: outConsumer must not be NULL");
 
     sp<IGraphicBufferProducer> producer;
     sp<IGraphicBufferConsumer> consumer;
@@ -118,16 +118,16 @@
     dvr::ProducerQueueConfigBuilder configBuilder;
     std::shared_ptr<dvr::ProducerQueue> producerQueue =
             dvr::ProducerQueue::Create(configBuilder.Build(), dvr::UsagePolicy{});
-    LOG_ALWAYS_FATAL_IF(producerQueue == NULL, "BufferQueue: failed to create ProducerQueue.");
+    LOG_ALWAYS_FATAL_IF(producerQueue == nullptr, "BufferQueue: failed to create ProducerQueue.");
 
     std::shared_ptr<dvr::ConsumerQueue> consumerQueue = producerQueue->CreateConsumerQueue();
-    LOG_ALWAYS_FATAL_IF(consumerQueue == NULL, "BufferQueue: failed to create ConsumerQueue.");
+    LOG_ALWAYS_FATAL_IF(consumerQueue == nullptr, "BufferQueue: failed to create ConsumerQueue.");
 
     producer = BufferHubProducer::Create(producerQueue);
     consumer = BufferHubConsumer::Create(consumerQueue);
 
-    LOG_ALWAYS_FATAL_IF(producer == NULL, "BufferQueue: failed to create BufferQueueProducer");
-    LOG_ALWAYS_FATAL_IF(consumer == NULL, "BufferQueue: failed to create BufferQueueConsumer");
+    LOG_ALWAYS_FATAL_IF(producer == nullptr, "BufferQueue: failed to create BufferQueueProducer");
+    LOG_ALWAYS_FATAL_IF(consumer == nullptr, "BufferQueue: failed to create BufferQueueConsumer");
 
     *outProducer = producer;
     *outConsumer = consumer;