diff --git a/libs/sensor/Sensor.cpp b/libs/sensor/Sensor.cpp
index 0a49008..efb18c0 100644
--- a/libs/sensor/Sensor.cpp
+++ b/libs/sensor/Sensor.cpp
@@ -612,7 +612,13 @@
         return false;
     }
     outputString8.setTo(static_cast<char const*>(buffer), len);
+
+    if (size < FlattenableUtils::align<4>(len)) {
+        ALOGE("Malformed Sensor String8 field. Should be in a 4-byte aligned buffer but is not.");
+        return false;
+    }
     FlattenableUtils::advance(buffer, size, FlattenableUtils::align<4>(len));
+
     return true;
 }