diff --git a/keystore/key_proto_handler.cpp b/keystore/key_proto_handler.cpp
index 3bf8c06..a106213 100644
--- a/keystore/key_proto_handler.cpp
+++ b/keystore/key_proto_handler.cpp
@@ -22,6 +22,7 @@
 #include <keymasterV4_0/Keymaster.h>
 #include <keystore/keymaster_types.h>
 #include <utils/String16.h>
+#include <utils/StrongPointer.h>
 
 #include "key_config.pb.h"
 
@@ -74,7 +75,7 @@
                                      bool wasCreationSuccessful) {
     KeyConfig keyConfig;
     checkEnforcedCharacteristics(keyParams, &keyConfig);
-    auto dropbox = std::make_unique<android::os::DropBoxManager>();
+    android::sp<android::os::DropBoxManager> dropbox(new android::os::DropBoxManager());
     keyConfig.set_was_creation_successful(wasCreationSuccessful);
 
     size_t size = keyConfig.ByteSize();
diff --git a/keystore/key_store_service.cpp b/keystore/key_store_service.cpp
index c831085..ccf7dfd 100644
--- a/keystore/key_store_service.cpp
+++ b/keystore/key_store_service.cpp
@@ -1584,7 +1584,7 @@
 }
 
 int isDeviceIdAttestationRequested(const KeymasterArguments& params) {
-    const hardware::hidl_vec<KeyParameter> paramsVec = params.getParameters();
+    const hardware::hidl_vec<KeyParameter>& paramsVec = params.getParameters();
     int result = 0;
     for (size_t i = 0; i < paramsVec.size(); ++i) {
         switch (paramsVec[i].tag) {
diff --git a/keystore/operation_proto_handler.cpp b/keystore/operation_proto_handler.cpp
index 77e1b73..992232d 100644
--- a/keystore/operation_proto_handler.cpp
+++ b/keystore/operation_proto_handler.cpp
@@ -23,6 +23,7 @@
 #include <keystore/keymaster_types.h>
 #include <keystore/keystore_hidl_support.h>
 #include <utils/String16.h>
+#include <utils/StrongPointer.h>
 
 #include "operation_config.pb.h"
 
@@ -108,7 +109,7 @@
     checkKeyCharacteristics(op.characteristics.softwareEnforced, &operationConfig);
     checkKeyCharacteristics(op.characteristics.hardwareEnforced, &operationConfig);
     checkOpCharacteristics(op.params, &operationConfig);
-    auto dropbox = std::make_unique<android::os::DropBoxManager>();
+    android::sp<android::os::DropBoxManager> dropbox(new android::os::DropBoxManager);
     operationConfig.set_was_op_successful(wasOpSuccessful);
 
     size_t size = operationConfig.ByteSize();