diff --git a/libwvdrmengine/cdm/core/src/initialization_data.cpp b/libwvdrmengine/cdm/core/src/initialization_data.cpp
index 86bb34e8..688b5249 100644
--- a/libwvdrmengine/cdm/core/src/initialization_data.cpp
+++ b/libwvdrmengine/cdm/core/src/initialization_data.cpp
@@ -357,7 +357,6 @@ bool InitializationData::ConstructWidevineInitData(
                           json_init_data.size());
 
   // Parse the Json string using jsmn
-  int result = 0;
   jsmn_parser parser;
   jsmntok_t tokens[kDefaultNumJsonTokens];
   jsmn_init(&parser);
diff --git a/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp b/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
index 5da8cca3..356a8745 100644
--- a/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
+++ b/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
@@ -526,7 +526,7 @@ static void dump_openssl_error() {
 // is different from the OpenSSL implementation, so we implement the CTR loop
 // ourselves.
 void ctr128_inc64(int64_t increaseBy, uint8_t* iv) {
-  ASSERT_TRUE(NULL != iv);
+  ASSERT_NE(static_cast<void*>(NULL), iv);
   uint64_t* counterBuffer = reinterpret_cast<uint64_t*>(&iv[8]);
   (*counterBuffer) =
       wvcdm::htonll64(wvcdm::ntohll64(*counterBuffer) + increaseBy);
@@ -877,9 +877,9 @@ class Session {
   void EncryptCTR(const vector<uint8_t>& in_buffer,const uint8_t *key,
                   const uint8_t* starting_iv,
                   vector<uint8_t>* out_buffer) {
-    ASSERT_TRUE(NULL != key);
-    ASSERT_TRUE(NULL != starting_iv);
-    ASSERT_TRUE(NULL != out_buffer);
+    ASSERT_NE(static_cast<void*>(NULL), key);
+    ASSERT_NE(static_cast<void*>(NULL), starting_iv);
+    ASSERT_NE(static_cast<void*>(NULL), out_buffer);
     AES_KEY aes_key;
     AES_set_encrypt_key(key, AES_BLOCK_SIZE * 8, &aes_key);
     out_buffer->resize(in_buffer.size());
@@ -1646,9 +1646,7 @@ TEST_F(OEMCryptoKeyboxTest, NormalGetKeyData) {
   ASSERT_EQ(OEMCrypto_SUCCESS, sts);
 }
 
-// TODO(fredgc): warn people that this will be turned on.  It causes a
-// seg fault on some devices at the moment.
-TEST_F(OEMCryptoKeyboxTest, DISABLED_GetKeyDataNullPointer) {
+TEST_F(OEMCryptoKeyboxTest, GetKeyDataNullPointer) {
   OEMCryptoResult sts;
   uint8_t key_data[256];
   sts = OEMCrypto_GetKeyData(key_data, NULL);
@@ -2366,6 +2364,59 @@ TEST_F(OEMCryptoSessionTests, DecryptZeroDuration) {
   ASSERT_NO_FATAL_FAILURE(s.TestDecryptCTR());
 }
 
+TEST_F(OEMCryptoSessionTests, SimultaneousDecrypt) {
+  vector<Session> s(8);
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].open());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].GenerateTestSessionKeys());
+    ASSERT_NO_FATAL_FAILURE(s[i].FillSimpleMessage(kDuration, 0,
+                                                   s[i].get_nonce()));
+    ASSERT_NO_FATAL_FAILURE(s[i].EncryptAndSign());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].LoadTestKeys());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].TestDecryptCTR());
+  }
+  // Second call to decrypt for each session.
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].TestDecryptCTR());
+  }
+}
+
+TEST_F(OEMCryptoSessionTests, SimultaneousDecryptWithLostMessage) {
+  vector<Session> s(8);
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].open());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].GenerateTestSessionKeys());
+    ASSERT_NO_FATAL_FAILURE(s[i].FillSimpleMessage(kDuration, 0,
+                                                   s[i].get_nonce()));
+    ASSERT_NO_FATAL_FAILURE(s[i].EncryptAndSign());
+  }
+  // First set of messages are lost.  Generate second set.
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].GenerateTestSessionKeys());
+    ASSERT_NO_FATAL_FAILURE(s[i].FillSimpleMessage(kDuration, 0,
+                                                   s[i].get_nonce()));
+    ASSERT_NO_FATAL_FAILURE(s[i].EncryptAndSign());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].LoadTestKeys());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].TestDecryptCTR());
+  }
+  // Second call to decrypt for each session.
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].TestDecryptCTR());
+  }
+}
+
 struct SampleSize {
   size_t clear_size;
   size_t encrypted_size;