Merge "Trim trailing zeros from build information." into vic-widevine-dev

libwvdrmengine/cdm/core/src/crypto_session.cpp

@@ -2541,6 +2541,17 @@ bool CryptoSession::GetBuildInformation(RequestedSecurityLevel security_level,
     return false;
   }
   info->resize(info_length);
+  // Some OEMCrypto implementations may include trailing null
+  // bytes in the output.  Trim them here.
+  while (!info->empty() && info->back() == '\0') {
+    info->pop_back();
+  }
+  if (info->empty()) {
+    LOGE("BuildInformation() returned corrupted data: length = %zu",
+         info_length);
+    return false;
+  }
+
   return true;
 }