diff --git a/drm/1.0/default/CryptoPlugin.cpp b/drm/1.0/default/CryptoPlugin.cpp
index 591861a..fd75dbd 100644
--- a/drm/1.0/default/CryptoPlugin.cpp
+++ b/drm/1.0/default/CryptoPlugin.cpp
@@ -51,7 +51,11 @@
 
     Return<void> CryptoPlugin::setSharedBufferBase(const hidl_memory& base,
             uint32_t bufferId) {
-        mSharedBufferMap[bufferId] = mapMemory(base);
+        sp<IMemory> hidlMemory = mapMemory(base);
+        ALOGE_IF(hidlMemory == nullptr, "mapMemory returns nullptr");
+
+        // allow mapMemory to return nullptr
+        mSharedBufferMap[bufferId] = hidlMemory;
         return Void();
     }
 
@@ -107,6 +111,10 @@
 
         AString detailMessage;
         sp<IMemory> sourceBase = mSharedBufferMap[source.bufferId];
+        if (sourceBase == nullptr) {
+            _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source is a nullptr");
+            return Void();
+        }
 
         if (source.offset + offset + source.size > sourceBase->getSize()) {
             _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size");
@@ -121,6 +129,11 @@
         if (destination.type == BufferType::SHARED_MEMORY) {
             const SharedBuffer& destBuffer = destination.nonsecureMemory;
             sp<IMemory> destBase = mSharedBufferMap[destBuffer.bufferId];
+            if (destBase == nullptr) {
+                _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "destination is a nullptr");
+                return Void();
+            }
+
             if (destBuffer.offset + destBuffer.size > destBase->getSize()) {
                 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size");
                 return Void();
diff --git a/drm/1.0/vts/functional/drm_hal_clearkey_test.cpp b/drm/1.0/vts/functional/drm_hal_clearkey_test.cpp
index 26641e8..eeee3c0 100644
--- a/drm/1.0/vts/functional/drm_hal_clearkey_test.cpp
+++ b/drm/1.0/vts/functional/drm_hal_clearkey_test.cpp
@@ -94,10 +94,10 @@
 
         drmFactory =
                 ::testing::VtsHalHidlTargetTestBase::getService<IDrmFactory>();
-        ASSERT_NE(drmFactory, nullptr);
+        ASSERT_NE(nullptr, drmFactory.get());
         cryptoFactory =
                 ::testing::VtsHalHidlTargetTestBase::getService<ICryptoFactory>();
-        ASSERT_NE(cryptoFactory, nullptr);
+        ASSERT_NE(nullptr, cryptoFactory.get());
     }
 
     virtual void TearDown() override {}
@@ -166,7 +166,7 @@
             kClearKeyUUID, packageName,
             [&](Status status, const sp<IDrmPlugin>& plugin) {
                 EXPECT_EQ(Status::OK, status);
-                EXPECT_NE(plugin, nullptr);
+                EXPECT_NE(nullptr, plugin.get());
             });
     EXPECT_OK(res);
 }
@@ -180,7 +180,7 @@
             kClearKeyUUID, initVec,
             [&](Status status, const sp<ICryptoPlugin>& plugin) {
                 EXPECT_EQ(Status::OK, status);
-                EXPECT_NE(plugin, nullptr);
+                EXPECT_NE(nullptr, plugin.get());
             });
     EXPECT_OK(res);
 }
@@ -194,7 +194,7 @@
             kInvalidUUID, packageName,
             [&](Status status, const sp<IDrmPlugin>& plugin) {
                 EXPECT_EQ(Status::ERROR_DRM_CANNOT_HANDLE, status);
-                EXPECT_EQ(plugin, nullptr);
+                EXPECT_EQ(nullptr, plugin.get());
             });
     EXPECT_OK(res);
 }
@@ -208,7 +208,7 @@
             kInvalidUUID, initVec,
             [&](Status status, const sp<ICryptoPlugin>& plugin) {
                 EXPECT_EQ(Status::ERROR_DRM_CANNOT_HANDLE, status);
-                EXPECT_EQ(plugin, nullptr);
+                EXPECT_EQ(nullptr, plugin.get());
             });
     EXPECT_OK(res);
 }
@@ -219,13 +219,13 @@
         // Create factories
         DrmHalClearkeyFactoryTest::SetUp();
 
-        ASSERT_NE(drmFactory, nullptr);
+        ASSERT_NE(nullptr, drmFactory.get());
         hidl_string packageName("android.hardware.drm.test");
         auto res = drmFactory->createPlugin(
                 kClearKeyUUID, packageName,
                 [this](Status status, const sp<IDrmPlugin>& plugin) {
                     EXPECT_EQ(Status::OK, status);
-                    ASSERT_NE(plugin, nullptr);
+                    ASSERT_NE(nullptr, plugin.get());
                     drmPlugin = plugin;
                 });
         ASSERT_OK(res);
@@ -235,7 +235,7 @@
                 kClearKeyUUID, initVec,
                 [this](Status status, const sp<ICryptoPlugin>& plugin) {
                     EXPECT_EQ(Status::OK, status);
-                    ASSERT_NE(plugin, nullptr);
+                    ASSERT_NE(nullptr, plugin.get());
                     cryptoPlugin = plugin;
                 });
         ASSERT_OK(res);
@@ -866,7 +866,7 @@
 sp<IMemory> DrmHalClearkeyPluginTest::getDecryptMemory(size_t size,
                                                        size_t index) {
     sp<IAllocator> ashmemAllocator = IAllocator::getService("ashmem");
-    EXPECT_NE(ashmemAllocator, nullptr);
+    EXPECT_NE(nullptr, ashmemAllocator.get());
 
     hidl_memory hidlMemory;
     auto res = ashmemAllocator->allocate(
@@ -878,6 +878,7 @@
     EXPECT_OK(res);
 
     sp<IMemory> mappedMemory = mapMemory(hidlMemory);
+    EXPECT_NE(nullptr, mappedMemory.get());
     EXPECT_OK(cryptoPlugin->setSharedBufferBase(hidlMemory, index));
     return mappedMemory;
 }
diff --git a/drm/1.0/vts/functional/drm_hal_vendor_test.cpp b/drm/1.0/vts/functional/drm_hal_vendor_test.cpp
index 67b2c7d..6ce465f 100644
--- a/drm/1.0/vts/functional/drm_hal_vendor_test.cpp
+++ b/drm/1.0/vts/functional/drm_hal_vendor_test.cpp
@@ -113,7 +113,7 @@
               test_info->test_case_name(), test_info->name(),
               GetParam().c_str());
 
-        ASSERT_NE(vendorModule, nullptr);
+        ASSERT_NE(nullptr, vendorModule.get());
 
         // First try the binderized service name provided by the vendor module.
         // If that fails, which it can on non-binderized devices, try the default
@@ -123,14 +123,14 @@
         if (drmFactory == nullptr) {
             drmFactory = VtsTestBase::getService<IDrmFactory>();
         }
-        ASSERT_NE(drmFactory, nullptr);
+        ASSERT_NE(nullptr, drmFactory.get());
 
         // Do the same for the crypto factory
         cryptoFactory = VtsTestBase::getService<ICryptoFactory>(name);
         if (cryptoFactory == nullptr) {
             cryptoFactory = VtsTestBase::getService<ICryptoFactory>();
         }
-        ASSERT_NE(cryptoFactory, nullptr);
+        ASSERT_NE(nullptr, cryptoFactory.get());
 
         // If drm scheme not installed skip subsequent tests
         if (!drmFactory->isCryptoSchemeSupported(getVendorUUID())) {
@@ -239,7 +239,7 @@
             getVendorUUID(), packageName,
             [&](Status status, const sp<IDrmPlugin>& plugin) {
                 EXPECT_EQ(Status::OK, status);
-                EXPECT_NE(plugin, nullptr);
+                EXPECT_NE(nullptr, plugin.get());
             });
     EXPECT_OK(res);
 }
@@ -254,7 +254,7 @@
             getVendorUUID(), initVec,
             [&](Status status, const sp<ICryptoPlugin>& plugin) {
                 EXPECT_EQ(Status::OK, status);
-                EXPECT_NE(plugin, nullptr);
+                EXPECT_NE(nullptr, plugin.get());
             });
     EXPECT_OK(res);
 }
@@ -269,7 +269,7 @@
             kInvalidUUID, packageName,
             [&](Status status, const sp<IDrmPlugin>& plugin) {
                 EXPECT_EQ(Status::ERROR_DRM_CANNOT_HANDLE, status);
-                EXPECT_EQ(plugin, nullptr);
+                EXPECT_EQ(nullptr, plugin.get());
             });
     EXPECT_OK(res);
 }
@@ -284,7 +284,7 @@
             kInvalidUUID, initVec,
             [&](Status status, const sp<ICryptoPlugin>& plugin) {
                 EXPECT_EQ(Status::ERROR_DRM_CANNOT_HANDLE, status);
-                EXPECT_EQ(plugin, nullptr);
+                EXPECT_EQ(nullptr, plugin.get());
             });
     EXPECT_OK(res);
 }
@@ -302,7 +302,7 @@
                 getVendorUUID(), packageName,
                 [this](Status status, const sp<IDrmPlugin>& plugin) {
                     EXPECT_EQ(Status::OK, status);
-                    ASSERT_NE(plugin, nullptr);
+                    ASSERT_NE(nullptr, plugin.get());
                     drmPlugin = plugin;
                 });
         ASSERT_OK(res);
@@ -312,7 +312,7 @@
                 getVendorUUID(), initVec,
                 [this](Status status, const sp<ICryptoPlugin>& plugin) {
                     EXPECT_EQ(Status::OK, status);
-                    ASSERT_NE(plugin, nullptr);
+                    ASSERT_NE(nullptr, plugin.get());
                     cryptoPlugin = plugin;
                 });
         ASSERT_OK(res);
@@ -1185,7 +1185,7 @@
 sp<IMemory> DrmHalVendorPluginTest::getDecryptMemory(size_t size,
                                                      size_t index) {
     sp<IAllocator> ashmemAllocator = IAllocator::getService("ashmem");
-    EXPECT_NE(ashmemAllocator, nullptr);
+    EXPECT_NE(nullptr, ashmemAllocator.get());
 
     hidl_memory hidlMemory;
     auto res = ashmemAllocator->allocate(
@@ -1198,7 +1198,7 @@
     EXPECT_OK(res);
 
     sp<IMemory> mappedMemory = mapMemory(hidlMemory);
-    EXPECT_NE(mappedMemory, nullptr);
+    EXPECT_NE(nullptr, mappedMemory.get());
     res = cryptoPlugin->setSharedBufferBase(hidlMemory, index);
     EXPECT_OK(res);
     return mappedMemory;