diff --git a/libwvdrmengine/mediadrm/src_hidl/WVDrmPlugin.cpp b/libwvdrmengine/mediadrm/src_hidl/WVDrmPlugin.cpp
index 1ef9916b..c1ddb155 100644
--- a/libwvdrmengine/mediadrm/src_hidl/WVDrmPlugin.cpp
+++ b/libwvdrmengine/mediadrm/src_hidl/WVDrmPlugin.cpp
@@ -1787,27 +1787,35 @@ Return<void> WVDrmPlugin::sendEvent(
     EventType eventType,
     const hidl_vec<uint8_t>& sessionId,
     const hidl_vec<uint8_t>& data) {
+  Return<void> err{};
   if (mListenerV1_2 != NULL) {
-    mListenerV1_2->sendEvent(eventType, sessionId, data);
+    err = mListenerV1_2->sendEvent(eventType, sessionId, data);
   } else if (mListener != NULL) {
-    mListener->sendEvent(eventType, sessionId, data);
+    err = mListener->sendEvent(eventType, sessionId, data);
   } else {
     ALOGE("Null event listener, event not sent");
   }
-  return Void();
+  if (!err.isOk()) {
+    ALOGW("sendEvent failed %s", err.description().c_str());
+  }
+  return err;
 }
 
 Return<void> WVDrmPlugin::sendExpirationUpdate(
     const hidl_vec<uint8_t>& sessionId,
         int64_t expiryTimeInMS) {
+  Return<void> err{};
   if (mListenerV1_2 != NULL) {
-    mListenerV1_2->sendExpirationUpdate(sessionId, expiryTimeInMS);
+    err = mListenerV1_2->sendExpirationUpdate(sessionId, expiryTimeInMS);
   } else if (mListener != NULL) {
-      mListener->sendExpirationUpdate(sessionId, expiryTimeInMS);
+    err = mListener->sendExpirationUpdate(sessionId, expiryTimeInMS);
   } else {
     ALOGE("Null event listener, event not sent");
   }
-  return Void();
+  if (!err.isOk()) {
+    ALOGW("sendExpirationUpdate failed %s", err.description().c_str());
+  }
+  return err;
 }
 
 template<>
@@ -1815,7 +1823,10 @@ void WVDrmPlugin::_sendKeysChange(
       const hidl_vec<uint8_t>& sessionId,
       const hidl_vec<KeyStatus>& keyStatusList,
       bool hasNewUsableKey) {
-  mListener->sendKeysChange(sessionId, keyStatusList, hasNewUsableKey);
+  auto err = mListener->sendKeysChange(sessionId, keyStatusList, hasNewUsableKey);
+  if (!err.isOk()) {
+    ALOGW("sendKeysChange failed %s", err.description().c_str());
+  }
 }
 
 template<>
@@ -1823,41 +1834,56 @@ void WVDrmPlugin::_sendKeysChange(
       const hidl_vec<uint8_t>& sessionId,
       const hidl_vec<KeyStatus_V1_2>& keyStatusList,
       bool hasNewUsableKey) {
-  mListenerV1_2->sendKeysChange_1_2(sessionId, keyStatusList, hasNewUsableKey);
+  auto err = mListenerV1_2->sendKeysChange_1_2(sessionId, keyStatusList, hasNewUsableKey);
+  if (!err.isOk()) {
+    ALOGW("sendKeysChange_1_2 failed %s", err.description().c_str());
+  }
 }
 
 Return<void> WVDrmPlugin::sendKeysChange(
      const hidl_vec<uint8_t>& sessionId,
      const hidl_vec<KeyStatus>& keyStatusList, bool hasNewUsableKey) {
+  Return<void> err{};
   if (mListenerV1_2 != NULL) {
-      mListenerV1_2->sendKeysChange(sessionId, keyStatusList, hasNewUsableKey);
+    err = mListenerV1_2->sendKeysChange(sessionId, keyStatusList, hasNewUsableKey);
   } else if (mListener != NULL) {
-      mListener->sendKeysChange(sessionId, keyStatusList, hasNewUsableKey);
+    err = mListener->sendKeysChange(sessionId, keyStatusList, hasNewUsableKey);
   } else {
     ALOGE("Null event listener, event not sent");
   }
-  return Void();
+  if (!err.isOk()) {
+    ALOGW("sendKeysChange failed %s", err.description().c_str());
+  }
+  return err;
 }
 
 Return<void> WVDrmPlugin::sendKeysChange_1_2(
      const hidl_vec<uint8_t>& sessionId,
      const hidl_vec<KeyStatus_V1_2>& keyStatusList, bool hasNewUsableKey) {
+  Return<void> err{};
   if (mListenerV1_2 != NULL) {
-      mListenerV1_2->sendKeysChange_1_2(sessionId, keyStatusList, hasNewUsableKey);
+    err = mListenerV1_2->sendKeysChange_1_2(sessionId, keyStatusList, hasNewUsableKey);
   } else {
     ALOGE("Null event listener, event not sent");
   }
-  return Void();
+  if (!err.isOk()) {
+    ALOGW("sendKeysChange_1_2 failed %s", err.description().c_str());
+  }
+  return err;
 }
 
 Return<void> WVDrmPlugin::sendSessionLostState(
     const hidl_vec<uint8_t>& sessionId) {
+  Return<void> err{};
   if (mListenerV1_2 != NULL) {
-    mListenerV1_2->sendSessionLostState(sessionId);
+    err = mListenerV1_2->sendSessionLostState(sessionId);
   } else {
     ALOGE("Null event listener, event not sent");
   }
-  return Void();
+  if (!err.isOk()) {
+    ALOGW("sendSessionLostState failed %s", err.description().c_str());
+  }
+  return err;
 }
 
 void WVDrmPlugin::OnSessionRenewalNeeded(const CdmSessionId& cdmSessionId) {
diff --git a/libwvdrmengine/oemcrypto/odk/test/odk_test.cpp b/libwvdrmengine/oemcrypto/odk/test/odk_test.cpp
index 1da4cc88..b5c85650 100644
--- a/libwvdrmengine/oemcrypto/odk/test/odk_test.cpp
+++ b/libwvdrmengine/oemcrypto/odk/test/odk_test.cpp
@@ -70,12 +70,12 @@ void ValidateRequest(uint32_t message_type,
 
   // non-empty buf, expect core message length to be set correctly, and buf is
   // filled with ODK_Field values appropriately
-  uint8_t* buf = new uint8_t[message_size];
+  uint8_t* buf = new uint8_t[message_size]{};
   EXPECT_EQ(OEMCrypto_SUCCESS,
             odk_prepare_func(buf, &core_message_length, &nonce_values));
   EXPECT_EQ(core_message_length, message_size);
 
-  uint8_t* buf_expected = new uint8_t[message_size];
+  uint8_t* buf_expected = new uint8_t[message_size]{};
   size_t buf_len_expected = 0;
   EXPECT_EQ(OEMCrypto_SUCCESS, ODK_IterFields(ODK_WRITE, buf_expected, SIZE_MAX,
                                               &buf_len_expected, total_fields));
@@ -94,7 +94,7 @@ void ValidateRequest(uint32_t message_type,
   nonce_values.api_major_version = t.api_major_version;
   nonce_values.nonce = t.nonce;
   nonce_values.session_id = t.session_id;
-  uint8_t* buf2 = new uint8_t[message_size];
+  uint8_t* buf2 = new uint8_t[message_size]{};
   EXPECT_EQ(OEMCrypto_SUCCESS,
             odk_prepare_func(buf2, &core_message_length, &nonce_values));
   EXPECT_EQ(core_message_length, message_size);
@@ -126,7 +126,7 @@ void ValidateResponse(ODK_CoreMessage* core_message,
   uint32_t buf_size = 0;
   ODK_BuildMessageBuffer(core_message, extra_fields, &buf, &buf_size);
 
-  uint8_t* zero = new uint8_t[buf_size];
+  uint8_t* zero = new uint8_t[buf_size]{};
   size_t bytes_read = 0;
   // zero-out input
   EXPECT_EQ(OEMCrypto_SUCCESS, ODK_IterFields(ODK_READ, zero, buf_size,
@@ -185,13 +185,13 @@ TEST(OdkTest, SerializeFieldsStress) {
     total_size += ODK_FieldLength(fields[i].type);
   }
 
-  uint8_t* buf = new uint8_t[total_size];
+  uint8_t* buf = new uint8_t[total_size]{};
   for (int i = 0; i < total_size; i++) {
     buf[i] = std::rand() & 0xff;
   }
 
   size_t bytes_read = 0, bytes_written = 0;
-  uint8_t* buf2 = new uint8_t[total_size];
+  uint8_t* buf2 = new uint8_t[total_size]{};
   ODK_IterFields(ODK_READ, buf, total_size, &bytes_read, fields);
   EXPECT_EQ(bytes_read, total_size);
   ODK_IterFields(ODK_WRITE, buf2, total_size, &bytes_written, fields);
diff --git a/libwvdrmengine/oemcrypto/odk/test/odk_test_helper.cpp b/libwvdrmengine/oemcrypto/odk/test/odk_test_helper.cpp
index fd240648..167d9e59 100644
--- a/libwvdrmengine/oemcrypto/odk/test/odk_test_helper.cpp
+++ b/libwvdrmengine/oemcrypto/odk/test/odk_test_helper.cpp
@@ -477,7 +477,7 @@ void ODK_BuildMessageBuffer(ODK_CoreMessage* core_message,
   // update message_size
   *(reinterpret_cast<uint32_t*>(total_fields[1].value)) = *buf_size;
 
-  *buf = new uint8_t[*buf_size];
+  *buf = new uint8_t[*buf_size]{};
   size_t bytes_written = 0;
   // serialize ODK fields to message buffer
   EXPECT_EQ(OEMCrypto_SUCCESS, ODK_IterFields(ODK_WRITE, *buf, SIZE_MAX,