Check for malformed Sensor Flattenable

Test: libsensorserviceaidl_fuzzer with testcase from bug
Bug: 269014004
Merged-In: I0e255c64243c38876fb657cbf942fc1613363216
Change-Id: I0e255c64243c38876fb657cbf942fc1613363216
(cherry picked from commit aeec1802f7befc8fbb18313ad3ac0969c3811870)
Merged-In: I0e255c64243c38876fb657cbf942fc1613363216
(cherry picked from commit on googleplex-android-review.googlesource.com host: 962b5a4d37bb13568ae4d93d10db9a3eb5166a38)
Merged-In: I0e255c64243c38876fb657cbf942fc1613363216

libs/sensor/Sensor.cpp

diff --git a/libs/sensor/Sensor.cpp b/libs/sensor/Sensor.cpp
index ec0ced8..b865c4d 100644
--- a/libs/sensor/Sensor.cpp
+++ b/libs/sensor/Sensor.cpp
@@ -632,7 +632,13 @@
         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;
 }