Prevent race conditions between decrypt and close session

[ Merge of http://go/wvgerrit/47520 ]

Bug: 73781703
Test: WV unit/integration tests, GTS GtsMediaTestCases tests and AUPT tests.
Change-Id: I618ed8ca38855aecdb31e829a7f4041cbd505a02

libwvdrmengine/cdm/core/src/cdm_session.cpp

@@ -66,6 +66,11 @@ CdmSession::~CdmSession() {
   }
 }
 
+void CdmSession::Close() {
+  AutoLock lock(close_lock_);
+  closed_ = true;
+}
+
 CdmResponseType CdmSession::Init(
     CdmClientPropertySet* cdm_client_property_set) {
   return Init(cdm_client_property_set, NULL, NULL);
@@ -567,10 +572,14 @@ CdmResponseType CdmSession::QueryOemCryptoSessionId(
 // Decrypt() - Accept encrypted buffer and return decrypted data.
 CdmResponseType CdmSession::Decrypt(const CdmDecryptionParameters& params) {
   if (!initialized_) {
-    LOGE("CdmSession::Decrypt: not initialized");
     return NOT_INITIALIZED_ERROR;
   }
 
+  AutoLock lock(close_lock_);
+  if (IsClosed()) {
+    return SESSION_CLOSED_1;
+  }
+
   // Playback may not begin until either the start time passes or the license
   // is updated, so we treat this Decrypt call as invalid.
   if (params.is_encrypted) {